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Writing Clearly and Concisely

Overview

William Strunk Jr.'s The Elements of Style (1918) teaches you to write clearly and cut ruthlessly. Apply these rules to task that requested by user.

All Rules

Elementary Rules of Usage (Grammar/Punctuation)

1. Form possessive singular by adding 's
2. Use comma after each term in series except last
3. Enclose parenthetic expressions between commas
4. Comma before conjunction introducing co-ordinate clause
5. Don't join independent clauses by comma
6. Don't break sentences in two
7. Participial phrase at beginning refers to grammatical subject

Elementary Principles of Composition

1. One paragraph per topic
2. Begin paragraph with topic sentence
3. Use active voice
4. Put statements in positive form
5. Use definite, specific, concrete language
6. Omit needless words
7. Avoid succession of loose sentences
8. Express co-ordinate ideas in similar form
9. Keep related words together
10. Keep to one tense in summaries
11. Place emphatic words at end of sentence

Section V: Words and Expressions Commonly Misused

Alphabetical reference for usage questions

The Elements of Style (1918)

Public domain text by William Strunk Jr.

Contents

• Writing Clearly and Concisely
  • Overview
  • All Rules
    • Elementary Rules of Usage (Grammar/Punctuation)
    • Elementary Principles of Composition
    • Section V: Words and Expressions Commonly Misused
• The Elements of Style (1918)
  • Contents
  • I. Introductory
  • II. Elementary Rules Of Usage
    • Rule 1. Form the possessive singular of nouns by adding 's
    • Rule 2. In a series of three or more terms with a single conjunction, use a comma after each term except the last
    • Rule 3. Enclose parenthetic expressions between commas
    • Rule 4. Place a comma before a conjunction introducing a co-ordinate clause
    • Rule 5. Do not join independent clauses by a comma
    • Rule 6. Do not break sentences in two
    • Rule 7. A participial phrase at the beginning of a sentence must refer to the grammatical subject
  • III. Elementary Principles Of Composition
    • Rule 8. Make the paragraph the unit of composition: one paragraph to each topic
    • Rule 9. As a rule, begin each paragraph with a topic sentence, end it in conformity with the beginning
    • Rule 10. Use the active voice
    • Rule 11. Put statements in positive form
    • Rule 12. Use definite, specific, concrete language
    • Rule 13. Omit needless words
    • Rule 14. Avoid a succession of loose sentences
    • Rule 15. Express co-ordinate ideas in similar form
    • Rule 16. Keep related words together
    • Rule 17. In summaries, keep to one tense
    • Rule 18. Place the emphatic words of a sentence at the end
  • V. Words And Expressions Commonly Misused

I. Introductory

This handbook summarizes the essentials of plain English style. It focuses on the rules of usage and principles of composition most often broken, offering a compact alternative to exhaustive manuals. Master the guidance here, then look to the best authors for finer points of style.

II. Elementary Rules Of Usage

Rule 1. Form the possessive singular of nouns by adding 's

Follow this rule whatever the final consonant. Thus write,

Charles's friend

Burns's poems

the witch's malice

This is the usage of the United States Government Printing Office and of the Oxford University Press.

Exceptions are the possessive of ancient proper names in -es and -is, the possessive Jesus', and such forms as for conscience' sake, for righteousness' sake. But such forms as Achilles' heel, Moses' laws, Isis' temple are commonly replaced by

the heel of Achilles

the laws of Moses

the temple of Isis

The pronominal possessives hers, its, theirs, yours, and oneself have no apostrophe.

Rule 2. In a series of three or more terms with a single conjunction, use a comma after each term except the last

Thus write,

red, white, and blue

gold, silver, or copper

He opened the letter, read it, and made a note of its contents.

This is also the usage of the Government Printing Office and of the Oxford University Press.

In the names of business firms the last comma is omitted, as,

Brown, Shipley & Co.

Rule 3. Enclose parenthetic expressions between commas

The best way to see a country, unless you are pressed for time, is to travel on foot.

This rule is difficult to apply; it is frequently hard to decide whether a single word, such as however, or a brief phrase, is or is not parenthetic. If the interruption to the flow of the sentence is but slight, the writer may safely omit the commas. But whether the interruption be slight or considerable, he must never insert one comma and omit the other. Such punctuation as

Marjorie's husband, Colonel Nelson paid us a visit yesterday,

or

My brother you will be pleased to hear, is now in perfect health,

is indefensible.

If a parenthetic expression is preceded by a conjunction, place the first comma before the conjunction, not after it.

He saw us coming, and unaware that we had learned of his treachery, greeted us with a smile.

Always to be regarded as parenthetic and to be enclosed between commas (or, at the end of the sentence, between comma and period) are the following:

(1) the year, when forming part of a date, and the day of the month, when following the day of the week:

February to July, 1916.

April 6, 1917.

Monday, November 11, 1918.

(2) the abbreviations etc. and jr.

(3) non-restrictive relative clauses, that is, those which do not serve to identify or define the antecedent noun, and similar clauses introduced by conjunctions indicating time or place.

The audience, which had at first been indifferent, became more and more interested.

In this sentence the clause introduced by which does not serve to tell which of several possible audiences is meant; what audience is in question is supposed to be already known. The clause adds, parenthetically, a statement supplementing that in the main clause. The sentence is virtually a combination of two statements which might have been made independently:

The audience had at first been indifferent. It became more and more interested.

Compare the restrictive relative clause, not set off by commas, in the sentence,

The candidate who best meets these requirements will obtain the place.

Here the clause introduced by who does serve to tell which of several possible candidates is meant; the sentence cannot be split up into two independent statements.

The difference in punctuation in the two sentences following is based on the same principle:

Nether Stowey, where Coleridge wrote The Rime of the Ancient Mariner, is a few miles from Bridgewater.

The day will come when you will admit your mistake.

Nether Stowey is completely identified by its name; the statement about Coleridge is therefore supplementary and parenthetic. The day spoken of is identified only by the dependent clause, which is therefore restrictive.

Similar in principle to the enclosing of parenthetic expressions between commas is the setting off by commas of phrases or dependent clauses preceding or following the main clause of a sentence.

Partly by hard fighting, partly by diplomatic skill, they enlarged their dominions to the east, and rose to royal rank with the possession of Sicily, exchanged afterwards for Sardinia.

Other illustrations may be found in sentences quoted under Rules 4, 5, 6, 7, 16, and 18.

The writer should be careful not to set off independent clauses by commas: see under Rule 5.

Rule 4. Place a comma before a conjunction introducing a co-ordinate clause

The early records of the city have disappeared, and the story of its first years can no longer be reconstructed.

The situation is perilous, but there is still one chance of escape.

Sentences of this type, isolated from their context, may seem to be in need of rewriting. As they make complete sense when the comma is reached, the second clause has the appearance of an afterthought. Further, and is the least specific of connectives. Used between independent clauses, it indicates only that a relation exists between them without defining that relation. In the example above, the relation is that of cause and result. The two sentences might be rewritten:

As the early records of the city have disappeared, the story of its first years can no longer be reconstructed.

Although the situation is perilous, there is still one chance of escape.

Or the subordinate clauses might be replaced by phrases:

Owing to the disappearance of the early records of the city, the story of its first years can no longer be reconstructed.

In this perilous situation, there is still one chance of escape.

But a writer may err by making his sentences too uniformly compact and periodic, and an occasional loose sentence prevents the style from becoming too formal and gives the reader a certain relief. Consequently, loose sentences of the type first quoted are common in easy, unstudied writing. But a writer should be careful not to construct too many of his sentences after this pattern (see Rule 14).

Two-part sentences of which the second member is introduced by as (in the sense of because), for, or, nor, and while (in the sense of and at the same time) likewise require a comma before the conjunction.

If the second member is introduced by an adverb, a semicolon, not a comma, is required (see Rule 5). The connectives so and yet may be used either as adverbs or as conjunctions, accordingly as the second clause is felt to be co-ordinate or subordinate; consequently either mark of punctuation may be justified. But these uses of so (equivalent to accordingly or to so that) are somewhat colloquial and should, as a rule, be avoided in writing. A simple correction, usually serviceable, is to omit the word so and begin the first clause with as or since:

If a dependent clause, or an introductory phrase requiring to be set off by a comma, precedes the second independent clause, no comma is needed after the conjunction.

The situation is perilous, but if we are prepared to act promptly, there is still one chance of escape.

When the subject is the same for both clauses and is expressed only once, a comma is required if the connective is but. If the connective is and, the comma should be omitted if the relation between the two statements is close or immediate.

I have heard his arguments, but am still unconvinced.

He has had several years' experience and is thoroughly competent.

Rule 5. Do not join independent clauses by a comma

If two or more clauses, grammatically complete and not joined by a conjunction, are to form a single compound sentence, the proper mark of punctuation is a semicolon.

Stevenson's romances are entertaining; they are full of exciting adventures.

It is nearly half past five; we cannot reach town before dark.

It is of course equally correct to write the above as two sentences each, replacing the semicolons by periods.

Stevenson's romances are entertaining. They are full of exciting adventures.

It is nearly half past five. We cannot reach town before dark.

If a conjunction is inserted the proper mark is a comma (Rule 4).

Stevenson's romances are entertaining, for they are full of exciting adventures.

It is nearly half past five, and we cannot reach town before dark.

A comparison of the three forms given above will show clearly the advantage of the first. It is, at least in the examples given, better than the second form, because it suggests the close relationship between the two statements in a way that the second does not attempt, and better than the third, because briefer and therefore more forcible. Indeed it may be said that this simple method of indicating relationship between statements is one of the most useful devices of composition. The relationship, as above, is commonly one of cause or of consequence.

Note that if the second clause is preceded by an adverb, such as accordingly, besides, then, therefore, or thus, and not by a conjunction, the semicolon is still required.

Two exceptions to the rule may be admitted. If the clauses are very short, and are alike in form, a comma is usually permissible:

Man proposes, God disposes.

The gate swung apart, the bridge fell, the portcullis was drawn up.

Note that in these examples the relation is not one of cause or consequence. Also in the colloquial form of expression,

I hardly knew him, he was so changed,

a comma, not a semicolon, is required. But this form of expression is inappropriate in writing, except in the dialogue of a story or play, or perhaps in a familiar letter.

Rule 6. Do not break sentences in two

In other words, do not use periods for commas.

I met them on a Cunard liner several years ago. Coming home from Liverpool to New York.

He was an interesting talker. A man who had traveled all over the world and lived in half a dozen countries.

In both these examples, the first period should be replaced by a comma, and the following word begun with a small letter.

It is permissible to make an emphatic word or expression serve the purpose of a sentence and to punctuate it accordingly:

Again and again he called out. No reply.

The writer must, however, be certain that the emphasis is warranted, and that he will not be suspected of a mere blunder in syntax or in punctuation.

Rules 3, 4, 5, and 6 cover the most important principles in the punctuation of ordinary sentences; they should be so thoroughly mastered that their application becomes second nature.

Rule 7. A participial phrase at the beginning of a sentence must refer to the grammatical subject

Walking slowly down the road, he saw a woman accompanied by two children.

The word walking refers to the subject of the sentence, not to the woman. If the writer wishes to make it refer to the woman, he must recast the sentence:

He saw a woman accompanied by two children, walking slowly down the road.

Participial phrases preceded by a conjunction or by a preposition, nouns in apposition, adjectives, and adjective phrases come under the same rule if they begin the sentence.

Sentences violating this rule are often ludicrous.

Being in a dilapidated condition, I was able to buy the house very cheap.

Wondering irresolutely what to do next, the clock struck twelve.

III. Elementary Principles Of Composition

Rule 8. Make the paragraph the unit of composition: one paragraph to each topic

If the subject on which you are writing is of slight extent, or if you intend to treat it very briefly, there may be no need of subdividing it into topics. Thus a brief description, a brief summary of a literary work, a brief account of a single incident, a narrative merely outlining an action, the setting forth of a single idea, any one of these is best written in a single paragraph. After the paragraph has been written, examine it to see whether subdivision will not improve it.

Ordinarily, however, a subject requires subdivision into topics, each of which should be made the subject of a paragraph. The object of treating each topic in a paragraph by itself is, of course, to aid the reader. The beginning of each paragraph is a signal to him that a new step in the development of the subject has been reached.

The extent of subdivision will vary with the length of the composition. For example, a short notice of a book or poem might consist of a single paragraph. One slightly longer might consist of two paragraphs:

• A. Account of the work.
• B. Critical discussion.

A report on a poem, written for a class in literature, might consist of seven paragraphs:

• A. Facts of composition and publication.
• B. Kind of poem; metrical form.
• C. Subject.
• D. Treatment of subject.
• E. For what chiefly remarkable.
• F. Wherein characteristic of the writer.
• G. Relationship to other works.

The contents of paragraphs C and D would vary with the poem. Usually, paragraph C would indicate the actual or imagined circumstances of the poem (the situation), if these call for explanation, and would then state the subject and outline its development. If the poem is a narrative in the third person throughout, paragraph C need contain no more than a concise summary of the action. Paragraph D would indicate the leading ideas and show how they are made prominent, or would indicate what points in the narrative are chiefly emphasized.

A novel might be discussed under the heads:

• A. Setting.
• B. Plot.
• C. Characters.
• D. Purpose.

An historical event might be discussed under the heads:

• A. What led up to the event.
• B. Account of the event.
• C. What the event led up to.

In treating either of these last two subjects, the writer would probably find it necessary to subdivide one or more of the topics here given.

As a rule, single sentences should not be written or printed as paragraphs. An exception may be made of sentences of transition, indicating the relation between the parts of an exposition or argument. Frequent exceptions are also necessary in textbooks, guidebooks, and other works in which many topics are treated briefly.

In dialogue, each speech, even if only a single word, is a paragraph by itself; that is, a new paragraph begins with each change of speaker. The application of this rule, when dialogue and narrative are combined, is best learned from examples in well-printed works of fiction.

Rule 9. As a rule, begin each paragraph with a topic sentence, end it in conformity with the beginning

Again, the object is to aid the reader. The practice here recommended enables him to discover the purpose of each paragraph as he begins to read it, and to retain this purpose in mind as he ends it. For this reason, the most generally useful kind of paragraph, particularly in exposition and argument, is that in which

(a) the topic sentence comes at or near the beginning;

(b) the succeeding sentences explain or establish or develop the statement made in the topic sentence; and

(c) the final sentence either emphasizes the thought of the topic sentence or states some important consequence.

Ending with a digression, or with an unimportant detail, is particularly to be avoided.

If the paragraph forms part of a larger composition, its relation to what precedes, or its function as a part of the whole, may need to be expressed. This can sometimes be done by a mere word or phrase (again; therefore; for the same reason) in the topic sentence. Sometimes, however, it is expedient to precede the topic sentence by one or more sentences of introduction or transition. If more than one such sentence is required, it is generally better to set apart the transitional sentences as a separate paragraph.

According to the writer's purpose, he may, as indicated above, relate the body of the paragraph to the topic sentence in one or more of several different ways. He may make the meaning of the topic sentence clearer by restating it in other forms, by defining its terms, by denying the contrary, by giving illustrations or specific instances; he may establish it by proofs; or he may develop it by showing its implications and consequences. In a long paragraph, he may carry out several of these processes.

1 Now, to be properly enjoyed, a walking tour should be gone upon alone. 2 If you go in a company, or even in pairs, it is no longer a walking tour in anything but name; it is something else and more in the nature of a picnic. 3 A walking tour should be gone upon alone, because freedom is of the essence; because you should be able to stop and go on, and follow this way or that, as the freak takes you; and because you must have your own pace, and neither trot alongside a champion walker, nor mince in time with a girl. 4 And you must be open to all impressions and let your thoughts take colour from what you see. 5 You should be as a pipe for any wind to play upon. 6 “I cannot see the wit,” says Hazlitt, “of walking and talking at the same time. 7 When I am in the country, I wish to vegetate like the country,” which is the gist of all that can be said upon the matter. 8 There should be no cackle of voices at your elbow, to jar on the meditative silence of the morning. 9 And so long as a man is reasoning he cannot surrender himself to that fine intoxication that comes of much motion in the open air, that begins in a sort of dazzle and sluggishness of the brain, and ends in a peace that passes comprehension.—Stevenson, Walking Tours.

1 Topic sentence. 2 The meaning made clearer by denial of the contrary. 3 The topic sentence repeated, in abridged form, and supported by three reasons; the meaning of the third (“you must have your own pace”) made clearer by denying the contrary. 4 A fourth reason, stated in two forms. 5 The same reason, stated in still another form. 6–7 The same reason as stated by Hazlitt. 8 Repetition, in paraphrase, of the quotation from Hazlitt. 9 Final statement of the fourth reason, in language amplified and heightened to form a strong conclusion.

1 It was chiefly in the eighteenth century that a very different conception of history grew up. 2 Historians then came to believe that their task was not so much to paint a picture as to solve a problem; to explain or illustrate the successive phases of national growth, prosperity, and adversity. 3 The history of morals, of industry, of intellect, and of art; the changes that take place in manners or beliefs; the dominant ideas that prevailed in successive periods; the rise, fall, and modification of political constitutions; in a word, all the conditions of national well-being became the subject of their works. 4 They sought rather to write a history of peoples than a history of kings. 5 They looked especially in history for the chain of causes and effects. 6 They undertook to study in the past the physiology of nations, and hoped by applying the experimental method on a large scale to deduce some lessons of real value about the conditions on which the welfare of society mainly depend.—Lecky, The Political Value of History.

1 Topic sentence. 2 The meaning of the topic sentence made clearer; the new conception of history defined. 3 The definition expanded. 4 The definition explained by contrast. 5 The definition supplemented: another element in the new conception of history. 6 Conclusion: an important consequence of the new conception of history.

In narration and description the paragraph sometimes begins with a concise, comprehensive statement serving to hold together the details that follow.

The breeze served us admirably.

The campaign opened with a series of reverses.

The next ten or twelve pages were filled with a curious set of entries.

But this device, if too often used, would become a mannerism. More commonly the opening sentence simply indicates by its subject with what the paragraph is to be principally concerned.

At length I thought I might return towards the stockade.

He picked up the heavy lamp from the table and began to explore.

Another flight of steps, and they emerged on the roof.

The brief paragraphs of animated narrative, however, are often without even this semblance of a topic sentence. The break between them serves the purpose of a rhetorical pause, throwing into prominence some detail of the action.

Rule 10. Use the active voice

The active voice is usually more direct and vigorous than the passive:

I shall always remember my first visit to Boston.

This is much better than

My first visit to Boston will always be remembered by me.

The latter sentence is less direct, less bold, and less concise. If the writer tries to make it more concise by omitting “by me,”

My first visit to Boston will always be remembered,

it becomes indefinite: is it the writer, or some person undisclosed, or the world at large, that will always remember this visit?

This rule does not, of course, mean that the writer should entirely discard the passive voice, which is frequently convenient and sometimes necessary.

The dramatists of the Restoration are little esteemed to-day.

Modern readers have little esteem for the dramatists of the Restoration.

The first would be the right form in a paragraph on the dramatists of the Restoration; the second, in a paragraph on the tastes of modern readers. The need of making a particular word the subject of the sentence will often, as in these examples, determine which voice is to be used.

As a rule, avoid making one passive depend directly upon another.

In both the examples above, before correction, the word properly related to the second passive is made the subject of the first.

A common fault is to use as the subject of a passive construction a noun which expresses the entire action, leaving to the verb no function beyond that of completing the sentence.

Compare the sentence, “The export of gold was prohibited,” in which the predicate “was prohibited” expresses something not implied in “export.”

The habitual use of the active voice makes for forcible writing. This is true not only in narrative principally concerned with action, but in writing of any kind. Many a tame sentence of description or exposition can be made lively and emphatic by substituting a verb in the active voice for some such perfunctory expression as there is, or could be heard.

Rule 11. Put statements in positive form

Make definite assertions. Avoid tame, colorless, hesitating, non-committal language. Use the word not as a means of denial or in antithesis, never as a means of evasion.

The last example, before correction, is indefinite as well as negative. The corrected version, consequently, is simply a guess at the writer's intention.

All three examples show the weakness inherent in the word not. Consciously or unconsciously, the reader is dissatisfied with being told only what is not; he wishes to be told what is. Hence, as a rule, it is better to express even a negative in positive form.

The antithesis of negative and positive is strong:

Not charity, but simple justice.

Not that I loved Caesar less, but Rome the more.

Negative words other than not are usually strong:

The sun never sets upon the British flag.

Rule 12. Use definite, specific, concrete language

Prefer the specific to the general, the definite to the vague, the concrete to the abstract.

If those who have studied the art of writing are in accord on any one point, it is on this, that the surest method of arousing and holding the attention of the reader is by being specific, definite, and concrete. Critics have pointed out how much of the effectiveness of the greatest writers, Homer, Dante, Shakespeare, results from their constant definiteness and concreteness. Browning, to cite a more modern author, affords many striking examples. Take, for instance, the lines from My Last Duchess,

Sir, 'twas all one! My favour at her breast,

The dropping of the daylight in the west,

The bough of cherries some officious fool

Broke in the orchard for her, the white mule

She rode with round the terrace—all and each

Would draw from her alike the approving speech,

Or blush, at least,

and those which end the poem,

Notice Neptune, though,

Taming a sea-horse, thought a rarity,

Which Claus of Innsbruck cast in bronze for me.

These words call up pictures. Recall how in The Bishop Orders his Tomb in St. Praxed's Church “the Renaissance spirit—its worldliness, inconsistency, pride, hypocrisy, ignorance of itself, love of art, of luxury, of good Latin,” to quote Ruskin's comment on the poem, is made manifest in specific details and in concrete terms.

Prose, in particular narrative and descriptive prose, is made vivid by the same means. If the experiences of Jim Hawkins and of David Balfour, of Kim, of Nostromo, have seemed for the moment real to countless readers, if in reading Carlyle we have almost the sense of being physically present at the taking of the Bastille, it is because of the definiteness of the details and the concreteness of the terms used. It is not that every detail is given; that would be impossible, as well as to no purpose; but that all the significant details are given, and not vaguely, but with such definiteness that the reader, in imagination, can project himself into the scene.

In exposition and in argument, the writer must likewise never lose his hold upon the concrete, and even when he is dealing with general principles, he must give particular instances of their application.

“This superiority of specific expressions is clearly due to the effort required to translate words into thoughts. As we do not think in generals, but in particulars—as whenever any class of things is referred to, we represent it to ourselves by calling to mind individual members of it, it follows that when an abstract word is used, the hearer or reader has to choose, from his stock of images, one or more by which he may figure to himself the genus mentioned. In doing this, some delay must arise, some force be expended; and if by employing a specific term an appropriate image can be at once suggested, an economy is achieved, and a more vivid impression produced.”

Herbert Spencer, from whose Philosophy of Style the preceding paragraph is quoted, illustrates the principle by the sentences:

Rule 13. Omit needless words

Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subjects only in outline, but that he make every word tell.

Many expressions in common use violate this principle:

In especial the expression the fact that should be revised out of every sentence in which it occurs.

See also under case, character, nature, system in Chapter V.

Who is, which was, and the like are often superfluous.

As positive statement is more concise than negative, and the active voice more concise than the passive, many of the examples given under Rules 11 and 12 illustrate this rule as well.

A common violation of conciseness is the presentation of a single complex idea, step by step, in a series of sentences or independent clauses which might to advantage be combined into one.

Rule 14. Avoid a succession of loose sentences

This rule refers especially to loose sentences of a particular type, those consisting of two co-ordinate clauses, the second introduced by a conjunction or relative. Although single sentences of this type may be unexceptionable (see under Rule 4), a series soon becomes monotonous and tedious.

An unskilful writer will sometimes construct a whole paragraph of sentences of this kind, using as connectives and, but, so, and less frequently, who, which, when, where, and while, these last in non-restrictive senses (see under Rule 3).

The third concert of the subscription series was given last evening, and a large audience was in attendance. Mr. Edward Appleton was the soloist, and the Boston Symphony Orchestra furnished the instrumental music. The former showed himself to be an artist of the first rank, while the latter proved itself fully deserving of its high reputation. The interest aroused by the series has been very gratifying to the Committee, and it is planned to give a similar series annually hereafter. The fourth concert will be given on Tuesday, May 10, when an equally attractive programme will be presented.

Apart from its triteness and emptiness, the paragraph above is weak because of the structure of its sentences, with their mechanical symmetry and sing-song. Contrast with them the sentences in the paragraphs quoted under Rule 9, or in any piece of good English prose, as the preface (Before the Curtain) to Vanity Fair.

If the writer finds that he has written a series of sentences of the type described, he should recast enough of them to remove the monotony, replacing them by simple sentences, by sentences of two clauses joined by a semicolon, by periodic sentences of two clauses, by sentences, loose or periodic, of three clauses—whichever best represent the real relations of the thought.

Rule 15. Express co-ordinate ideas in similar form

This principle, that of parallel construction, requires that expressions of similar content and function should be outwardly similar. The likeness of form enables the reader to recognize more readily the likeness of content and function. Familiar instances from the Bible are the Ten Commandments, the Beatitudes, and the petitions of the Lord's Prayer.

The unskillful writer often violates this principle, from a mistaken belief that he should constantly vary the form of his expressions. It is true that in repeating a statement in order to emphasize it he may have need to vary its form. For illustration, see the paragraph from Stevenson quoted under Rule 9. But apart from this, he should follow the principle of parallel construction.

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