4.3 Mechanics: Punctuation & Capitalization

Mechanics: Punctuation and Capitalization

Mechanics questions test the conventions of Standard English — punctuation, capitalization, and spelling. On 5038 they appear as edit-the-sentence items: choose the correctly punctuated version, or identify the sentence that contains the error.

Comma Rules

The comma is the most heavily tested mark. Master these six uses:

• Compound sentence: place a comma before a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so) that joins two independent clauses — 'It rained, but we still hiked'.
• Introductory element: add a comma after an introductory word, phrase, or clause — 'After the storm, we cleaned up the yard'.
• Nonrestrictive (nonessential) elements: set them off with commas — 'My brother, who is a doctor, lives in Chicago'. Do not enclose restrictive clauses that are essential to meaning ('The man who lives next door is a doctor').
• Series: separate three or more items; the Oxford (serial) comma before 'and' is accepted and often prevents ambiguity.
• Coordinate adjectives: 'a long, boring lecture' (test: could you insert 'and' between them?).
• Dates, addresses, titles: 'July 3, 2026,' and 'Austin, Texas,'.

Semicolons and Colons

A semicolon does two jobs: it (1) joins two closely related independent clauses without a conjunction ('The sun is shining; it is a beautiful day') and (2) separates items in a series when the items themselves contain commas ('Boise, Idaho; Los Angeles, California; and Reno, Nevada'). A colon introduces a list, explanation, or quotation after a complete independent clause ('She packed three things: a map, a snack, and water'). A frequent error is a colon placed after a verb or preposition ('She packed: a map...'); that is wrong because 'She packed' is not a complete independent clause.

Apostrophes

Apostrophes show possession or mark contractions — never plurals.

• Singular possessive: add 's — 'the dog**'s** bone'.
• Plural ending in -s: add only ' — 'the dogs**'** bones'.
• Plural not ending in -s: add 's — 'the children**'s** toys'.
• Contractions: 'it's' means 'it is'; 'its' (no apostrophe) is possessive. The same split governs your/you're, their/there/they're, and whose/who's.

Quotation Marks

Use quotation marks for direct speech and for titles of short works (poems, articles, short stories, songs). In American usage, periods and commas go inside the closing quotation mark; semicolons and colons go outside; a question mark goes inside only when the quotation itself is the question. Titles of long works (novels, plays, films) are italicized, not placed in quotation marks.

Dashes, Hyphens, and Parentheses

• Hyphen: joins a compound modifier before a noun ('a well-known author', 'a two-thirds majority').
• Em dash: sets off an abrupt break or an emphatic aside ('The answer, surprisingly, was no' can become 'The answer — surprisingly — was no').
• Parentheses: enclose minor, de-emphasized information. Dashes emphasize; parentheses downplay.

End Punctuation and Capitalization

End marks match sentence purpose: a period ends declarative and imperative sentences, a question mark ends interrogatives, and an exclamation point ends exclamatory sentences. Capitalize: the first word of a sentence; the pronoun I; proper nouns (specific people, places, brands); days, months, and holidays (but not seasons); languages and nationalities; a title used before a name ('President Lincoln' but 'the president spoke'); and the first word plus all major words in a title (not short articles or prepositions unless they begin the title).

Punctuation Reference Table

Spelling Patterns

Praxis rewards recognizing standard patterns: i before e except after c (believe, receive), with exceptions (weird, seize); drop the silent -e before a vowel suffix (hope becomes hoping); double the final consonant on a stressed consonant-vowel-consonant syllable before a vowel suffix (refer becomes referred, but 'benefited' keeps one t because the stress is not on the last syllable); and change -y to -i before a suffix (happy becomes happiness). Most 5038 spelling traps are homophones: principal/principle, stationary/stationery, complement/compliment, accept/except, and than/then.

Worked Editing Item

'After the meeting the committee reviewed three proposals, however only one was funded.' Two problems appear: a missing comma after the introductory phrase 'After the meeting', and a comma splice created by 'however', which is a conjunctive adverb, not a coordinating conjunction. Corrected: 'After the meeting, the committee reviewed three proposals; however, only one was funded'. The tested fix is a semicolon before the conjunctive adverb and a comma after it.

Common Mechanics Traps

Several errors show up on nearly every 5038 mechanics set, so memorize the correct handling:

• Conjunctive adverbs (however, therefore, moreover, consequently, thus) are not coordinating conjunctions; a comma before them creates a splice. Use a semicolon (or a period) instead.
• Its/it's, your/you're, their/there/they're, whose/who's: the apostrophe version is always a contraction, never a possessive.
• Comma before a subordinate clause: a dependent clause that follows the main clause usually needs no comma ('We left because it rained'), but an introductory dependent clause does ('Because it rained, we left').
• Coordinate versus cumulative adjectives: use a comma only when you could reverse the adjectives or insert 'and' ('a bright, cheerful room' but 'a dark leather chair').
• Title capitalization: capitalize the first and last words and all major words; keep short articles, coordinating conjunctions, and prepositions under five letters lowercase unless they open the title.

Second Worked Editing Item

'My sister who lives in Denver, is visiting next week.' The clause 'who lives in Denver' is punctuated inconsistently: it has a closing comma but no opening one. If the writer has one sister, the clause is nonessential and needs commas on both sides ('My sister, who lives in Denver, is visiting'). If the writer has several sisters, the clause is essential and takes no commas ('My sister who lives in Denver is visiting'). Deciding restrictive versus nonrestrictive determines whether both commas stay or both go — never just one.