Commas: Introductions, Lists, Adjectives — and When NOT to Use One

American Diploma › Digital SAT Reading and Writing — Complete Course

What this question type tests

Comma questions belong to the Boundaries skill in the Standard English Conventions domain (about 26% of the scored Reading and Writing questions, 11–15 questions in total). The College Board describes this skill as punctuation at the end of sentences and inside them: linking clauses, separating list items, setting off supplements, and knowing when no punctuation is needed — for example, never between a subject and its verb.

The question is always the same: a short passage (25–150 words) with a blank and the stem “Which choice completes the text so that it conforms to the conventions of Standard English?” This lesson covers the four comma jobs that are not about extra information — introductions, lists, adjectives and FANBOYS — and then the most important list of all: the places where a comma is never allowed. (Commas in pairs around extra information have their own lesson: Extra Information.)

Job 1: After an introductory word, phrase or clause

When something comes before the main clause (the subject and its verb), put a comma after it. This tells the reader where the main sentence begins.

• ✗ Because the road was flooded; the bus took a different route. (a semicolon needs a complete sentence on both sides)
• ✗ Because the road was flooded. The bus took a different route. (the first part is a fragment)
• ✗ Because the road, was flooded the bus took a different route. (the comma is inside the introduction, between its subject and verb)
• ✗ Although the road was flooded, but the bus arrived on time. (although + but: two linking words for one join)

The reverse order: when the dependent clause comes after the main clause, you normally need no comma: “The bus took a different route because the road was flooded.” A very short introduction (“In 2015 the museum reopened”) may take a comma or not; the test will not make you choose on that alone.

Job 2: Before FANBOYS joining two complete sentences

FANBOYS = for, and, nor, but, or, yet, so. When one of them joins two independent clauses, put a comma before it, never after it. (The full rules for joining clauses are on the Sentence Boundaries page.)

• ✓ The road was closed, but the bus found another route.
• ✗ The road was closed but, the bus found another route. (comma after the FANBOYS word)
• ✗ The road was closed, the bus found another route. (comma splice — the FANBOYS word is missing)

Job 3: Between items in a list

Separate three or more items with commas. The comma before the final “and” or “or” is called the serial comma (Oxford comma). Using it is always safe.

• ✓ The kit contains a compass, a flashlight, and a first-aid manual.
• ✓ Over the weekend, the volunteers planted trees, cleaned the canal banks, and painted the school. (the items can be verb phrases)
• ✓ Two items only: “a compass and a flashlight” — no comma.
• ✗ The kit contains a compass a flashlight, and a first-aid manual. (comma missing between the first two items)
• ✗ The kit contains, a compass, a flashlight, and a first-aid manual. (comma between the verb and its object)
• ✗ A compass, a flashlight, and a manual, are in the kit. (comma after the last item splits the subject from the verb)
• ✗ Spices such as, cumin, coriander, and cardamom are used. (no comma right after “such as”)

When the items themselves already contain commas (“Luxor, Egypt”), the items are separated by semicolons — a special SAT/ACT rule taught in the Semicolons lesson.

Job 4: Between coordinate adjectives

Two adjectives before a noun are coordinate when each one describes the noun separately and equally. Coordinate adjectives take a comma between them. Cumulative adjectives build on each other (the first one describes the second adjective + noun together) and take no comma.

Two quick tests — if both work naturally, use a comma:

1. Swap test: change the order. “a steep, long climb” still sounds natural → coordinate.
2. “And” test: put “and” between them. “a long and steep climb” sounds natural → coordinate.

• ✗ It was a long, difficult, journey. (never a comma between the last adjective and the noun)
• ✗ They found a small, wooden chest. (cumulative adjectives: size + material)

When NOT to use a comma — the big list

On the SAT an unnecessary comma is an error, not a matter of style. Many questions offer three choices that put a comma in a forbidden place and one choice with no punctuation. Learn these no-comma zones:

Worked examples

Worked example 1 — introductory clause

Text: Farmers in the valley had waited months for rain. When the rains finally arrived in late October ______ began planting wheat and barley on the same day.

Which choice completes the text so that it conforms to the conventions of Standard English?

• A) October; farmers
• B) October, farmers
• C) October farmers,
• D) October. Farmers

Answer: B

• A) ✗ Wrong: A semicolon needs a complete sentence before it; “When the rains finally arrived in late October” is a dependent clause.
• B) ✓ Correct: An introductory dependent clause is followed by a comma, then the main clause “farmers began planting …”.
• C) ✗ Wrong: Two errors: no comma after the introduction, and a comma between the subject “farmers” and its verb “began.”
• D) ✗ Wrong: The period leaves “When the rains finally arrived in late October.” as a fragment.

Worked example 2 — coordinate adjectives

Text: Visitors to the monastery are warned to wear good shoes. The path from the village to the gate is a narrow ______ that can be dangerous after rain.

Which choice completes the text so that it conforms to the conventions of Standard English?

• A) winding path
• B) winding, path
• C) , winding path
• D) , winding path,

Answer: C

• A) ✗ Wrong: Trap: “a narrow and winding path” sounds natural, and so does “a winding, narrow path,” so the adjectives are coordinate and need a comma between them.
• B) ✗ Wrong: The comma comes between the two adjectives, never between the last adjective and the noun.
• C) ✓ Correct: Both tests work, so “narrow, winding” are coordinate adjectives: “a narrow, winding path that can be dangerous …” ✓
• D) ✗ Wrong: Trap: the comma after “path” separates the noun from its essential that-clause.

Worked example 3 — items in a list

Text: The village school had not been repaired for years, so the student council organized a work weekend. Over two days, the volunteers planted trees, cleaned the canal banks ______ painted the walls of every classroom.

Which choice completes the text so that it conforms to the conventions of Standard English?

• A) , and
• B) and,
• C) , and,
• D) ; and

Answer: A

• A) ✓ Correct: The third item in a list of three verb phrases is introduced by “, and.” The serial comma matches the comma already used after “trees.”
• B) ✗ Wrong: Trap: a comma after “and” separates the conjunction from the item it introduces.
• C) ✗ Wrong: Trap: the second comma separates “and” from “painted.”
• D) ✗ Wrong: A semicolon is used between list items only when the items already contain commas (SAT/ACT extra rule). These items do not.

Worked example 4 — compound predicate

Text: The novelist Salma Nabil publishes her books in both Arabic and English. For her newest book, the author wrote the first draft in Arabic ______ translated it into English herself.

Which choice completes the text so that it conforms to the conventions of Standard English?

• A) , and,
• B) ; and
• C) and
• D) , and

Answer: C

• A) ✗ Wrong: Trap: two extra commas, one on each side of “and.”
• B) ✗ Wrong: A semicolon needs a complete sentence on both sides; “translated it into English herself” has no subject.
• C) ✓ Correct: One subject (“the author”) has two verbs (“wrote … and translated …”). This is a compound predicate, so no comma comes before “and.”
• D) ✗ Wrong: Trap: this is the most common wrong answer. A comma + “and” joins two complete sentences; here the second part has no subject of its own.

Practice

Ten original Digital SAT-style questions on introductions, lists, adjectives and the no-comma zones.

All pages in this course

Start here

• The Digital SAT: Complete Overview
• Time Strategy and How to Attack Every Question

Craft and Structure

• Words in Context
• High-Value Vocabulary for SAT Reading and Writing
• Text Structure and Purpose
• Cross-Text Connections

Information and Ideas

• Central Ideas and Details
• Command of Evidence: Textual
• Command of Evidence: Quantitative
• Inferences

Standard English Conventions

• Sentence Boundaries
• Extra Information: Commas, Dashes and Brackets in Pairs
• Commas: Introductions, Lists, Adjectives — and When NOT to Use One
• Semicolons: Joining Two Complete Sentences
• Colons: After a Complete Sentence
• Dashes — and Choosing Between , ; : —
• Subject–Verb Agreement
• Pronoun–Antecedent Agreement, Clarity and Consistency
• Pronoun Case and Sound-Alike Pronouns
• Verb Tense and Aspect
• Verb Finiteness: Gerunds, Participles and Infinitives
• Dangling and Misplaced Modifiers
• Parallel Structure
• Faulty and Logical Comparisons
• Plurals and Possessives

Expression of Ideas

• Transitions
• Rhetorical Synthesis (Student Notes)

Full practice tests

• Digital SAT Reading and Writing — Practice Test 1
• Digital SAT Reading and Writing — Practice Test 2
• Digital SAT Reading and Writing — Practice Test 3