Punctuation & Conventions — English

Read for introductory word groups — a comma usually follows a clause or phrase that comes before the main subject.

Information you could lift out without changing the core meaning (a nonrestrictive element) gets set off with commas.

When two adjectives independently modify the same noun, or when a coordinating conjunction joins two complete sentences, a comma belongs there.

Corrected passage: When the bell rang, the students hurried outside. My best friend Dana, who lives next door, waited for me by the gate. We walked home together, talking about the game. It was a warm, bright afternoon, and we were in no hurry.

Rules:

1. When the bell rang, — a comma follows an introductory dependent clause before the main clause.

2. , who lives next door, — this is a nonrestrictive relative clause (extra information not needed to identify Dana), so it is set off with a pair of commas.

3. warm, bright afternoon — warm and bright are coordinate adjectives that each independently modify afternoon, so a comma separates them.

4. afternoon, and we were in no hurry — a comma goes before the coordinating conjunction and when it joins two independent clauses. (I also set off the nonessential phrase talking about the game with a comma.)

Response criteria

• Adds a comma after the introductory clause When the bell rang.
• Sets off the nonrestrictive clause who lives next door with a pair of commas.
• Adds a comma between the coordinate adjectives warm and bright.
• Adds a comma before and joining the two independent clauses in the last sentence.
• Names the correct rule for at least three of the four commas.

A colon introduces a list, explanation, or example after a complete statement.

A semicolon joins two closely related independent clauses without a conjunction; a comma alone between two independent clauses is a comma splice.

Test each spot: is a full sentence sitting on each side (semicolon territory), or is one side introducing a list or explanation (colon territory)?

Corrected passage: The recipe calls for three things: flour, butter, and sugar. Mix the dry ingredients first; then add the butter. The dough will be crumbly; that is normal. Bake for twelve minutes; the edges should turn golden.

Colon in three things: flour, butter, and sugar — the clause before the colon (The recipe calls for three things) is complete, and the colon introduces the list that specifies those things. A colon's job is to point forward to a list, example, or explanation.

Semicolons in first; then add the butter, crumbly; that is normal, and twelve minutes; the edges should turn golden — in each case there is a complete independent clause on both sides, closely related in meaning, with no coordinating conjunction. A semicolon links such clauses. A comma alone (as in crumbly, that is normal) would be a comma splice, and no punctuation at all (as in twelve minutes the edges) is a fused run-on.

Response criteria

• Uses a colon correctly to introduce the list (three things: flour, butter, and sugar).
• Uses semicolons to join the independent clauses (at least two of the three spots corrected).
• Explains that a colon introduces a list, example, or explanation following a complete clause.
• Explains that a semicolon links two related independent clauses (and that a comma there would be a splice).

List the items in each series and label their form (adjective? noun? infinitive to ___? -ing word? whole clause?).

Parallelism means every item in the series takes the same grammatical form.

Pick the form that most items already use, then convert the odd ones to match it.

Revisions:

1. A good tutor is patient, encouraging, and clear.

2. My goals this term are to raise my grades, sleep better, and join the debate team.

3. The coach told us to arrive early, stretch, and warm up slowly.

Explanation (sentence 1): The original series was patient, encouraging, and explains things clearly. The first two items are adjectives, but the third, explains things clearly, is a verb phrase — so the elements did not match. I changed the third item to the adjective clear, so now all three are adjectives that fit the same slot after is. The series is parallel because every item is the same part of speech and could complete the sentence on its own.

Response criteria

• Revises the first sentence so all three items share one form (e.g., three adjectives: patient, encouraging, and clear).
• Revises the second sentence into a parallel series (e.g., to raise my grades, sleep better, and join the debate team).
• Revises the third sentence into a parallel series (e.g., to arrive early, stretch, and warm up slowly).
• Explains, for at least one sentence, the specific grammatical mismatch and how the fix restores parallelism.

A pair of dashes can set off a dramatic interruption or list; a single dash can create a pause before a reveal.

An ellipsis (three spaced dots) can mark a trailing-off, hesitation, or the passage of time.

Compare the feel of a dash or ellipsis to a plain comma — which creates a longer or more dramatic pause?

The single dash in one thing left in the box — a single brass key creates a pause and then delivers a reveal. Grammatically it introduces an appositive that renames one thing; its effect is dramatic, holding the reader for a beat before the key appears. Used correctly.

The ellipsis in hesitated at the door … then turned the handle marks hesitation and a stretch of time. It slows the pace, letting the reader feel the character's pause before she acts. Used correctly.

The paired dashes in Everything she had been told — the warnings, the rumors, the locked-room stories — came rushing back set off an interrupting list. They break into the main clause (Everything she had been told… came rushing back) to pile up vivid specifics, emphasizing how much floods her mind. Because they come in a matched pair around the inserted list, they are used correctly.

If these marks were replaced with ordinary commas, the passage would lose its drama and its varied pace: a comma before a single brass key would make the reveal flat and matter-of-fact, a comma in place of the ellipsis would erase the sense of hesitation and passing time, and commas around the list would blend it into the sentence rather than interrupting for emphasis.

Response criteria

• Explains the function of the single dash before a single brass key (a pause that sets up a reveal or appositive).
• Explains the function of the ellipsis in hesitated at the door … then (hesitation or a trailing pause / passing time).
• Explains the function of the paired dashes around the warnings, the rumors, the locked-room stories (setting off an interrupting list for emphasis).
• Judges the marks as used correctly and describes how ordinary commas would change the pace or effect.

An apostrophe marks either a contraction (it's = it is / it has) or a possessive (the team's bus). Possessive pronouns like its, their, and whose never take an apostrophe.

For each its/it's, there/their/they're, or whos/whose, test by expanding the contraction: does it is, they are, or who is fit? If yes, use the apostrophe form.

Watch the difference between singular and plural possessives (one whistle becomes whistle's; many whistles becomes whistles').

Corrected passage: It's been a long week for the team, and they're finally getting a break. The players know their schedule changes on Friday, but they're not sure who's driving. The coach lost her whistle, so the whistle's sound won't echo across the field today.

Rules:

1. It's been uses an apostrophe because it's is a contraction of it has. The possessive its (as in the dog wagged its tail) never takes an apostrophe — that is the most common mix-up. Here we mean it has been, so the apostrophe is correct.

2. they're finally and they're not sure use the contraction of they are, which fits both spots. But their schedule is the possessive pronoun meaning the schedule belonging to them, and possessive pronouns take no apostrophe — so that one is their, not they're or there.

3. who's driving is the contraction of who is (the possessive whose, meaning belonging to whom, would not fit). And the whistle's sound is a singular possessive — one whistle, so the apostrophe goes before the s; the original whistles' would mean several whistles. Finally, won't is the contraction of will not.

Response criteria

• Corrects the contraction errors: It's been, they're finally, they're not sure, who's driving, and won't.
• Corrects the possessive pronoun their schedule.
• Corrects the singular possessive the whistle's sound (not whistles').
• Explains at least three rules, clearly distinguishing a contraction (apostrophe) from a possessive pronoun (no apostrophe).

A conjunctive adverb (however, therefore, moreover) linking two complete sentences is preceded by a semicolon and usually followed by a comma.

When you introduce a quotation with a signal phrase like As Rivera notes, set it off with a comma, and in American style place the closing period inside the quotation marks.

A contrasting element introduced by not is set off with a comma (a habit, not a trait).

Edited passage: In her essay Rivera makes a bold claim: curiosity can be taught. She writes that wonder is a habit, not a trait. Many teachers agree; however, the research is thin. As Rivera notes, “A curious mind asks better questions.” The sample was small; therefore, we should be cautious.

Conventions:

1. agree; however, the research is thin and small; therefore, we should be cautious — however and therefore are conjunctive adverbs. When a conjunctive adverb joins two independent clauses, it takes a semicolon before it and a comma after it. The originals ran the clauses together, creating run-ons.

2. As Rivera notes, “A curious mind asks better questions.” — a signal phrase introducing a quotation is followed by a comma, the quotation begins with a capital letter, and in American usage the closing period sits inside the quotation marks, not outside as in the original.

3. a habit, not a trait — a contrasting phrase introduced by not is set off with a comma. I also changed the opening bold claim, curiosity can be taught to a colon, because a colon properly introduces the statement that spells out the claim.

Response criteria

• Corrects the two conjunctive-adverb errors with semicolons (and commas): agree; however, and small; therefore,.
• Correctly punctuates the quotation: a comma after the signal phrase and the period inside the closing quotation mark.
• Adds the comma before the contrasting not a trait (and fixes the opening claim, e.g., with a colon).
• Explains the convention behind at least three fixes using correct terms (conjunctive adverb, signal phrase, contrast).

In Version A, the commas set off who finished early as extra, removable information. Read the sentence without that clause — who went outside?

In Version B, who finished early has no commas, so it narrows down which students are meant.

The comma-set-off version is nonrestrictive (adds extra info about all of them); the no-comma version is restrictive (identifies a subset).

In Version A — The students, who finished early, went outside — the commas set off who finished early as nonrestrictive, removable information. That means the clause describes all the students: every one of them finished early, and all of them went outside. If you delete the clause, The students went outside, the meaning still holds.

In Version B — The students who finished early went outside — there are no commas, so who finished early is restrictive: it identifies which students are meant. Here only the subset who finished early went outside; the others presumably stayed. The clause is essential and cannot be removed without changing the meaning.

So the commas signal a nonrestrictive clause (extra information about the whole group), while the absence of commas signals a restrictive clause (information that narrows the group).

My own pair: (1) My sister, who lives in Denver, is visiting — with commas, nonrestrictive: I have only one sister, and, by the way, she lives in Denver. (2) My sister who lives in Denver is visiting — no commas, restrictive: I have more than one sister, and the one from Denver is the one visiting. The punctuation alone tells the reader whether I have one sister or several.

Response criteria

• Explains that in Version A (with commas) all the students finished early and all went outside.
• Explains that in Version B (no commas) only the subset who finished early went outside.
• Correctly names the concept: commas signal a nonrestrictive clause; no commas signal a restrictive clause.
• Provides an original pair of sentences whose meaning changes with punctuation, with a correct explanation of the difference.