ACT Comma Practice Questions with Answers

Mastering the ACT Comma rules is one of the most effective ways to boost your score on the English section, as punctuation accounts for a significant portion of the total questions. The ACT tests your ability to use commas to separate items in a list, join independent clauses, set off non-essential information, and clarify introductory phrases. By understanding these specific grammatical patterns, you can eliminate common errors and approach the exam with confidence.

To succeed in your ACT Prep, you must recognize that the ACT often tests whether a comma is necessary at all. Many students lose points by adding "pause commas" where the rules of formal English do not require them. For a broader look at the test's structure, you might also find ACT English Practice Questions with Answers helpful for contextualizing these punctuation rules within full passages.

Concept Explanation

The ACT Comma refers to a set of four primary punctuation rules used by the ACT to test a student's mastery of sentence structure and clarity. These rules ensure that sentences are readable and that relationships between ideas are logically defined. The ACT focuses on the following four areas:

• Connecting Independent Clauses: Use a comma plus a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so) to join two complete sentences. For example: "The rain started, so we went inside."
• Introductory Phrases: Use a comma after a dependent clause or a long prepositional phrase that starts a sentence. For example: "After the long movie ended, we grabbed dinner."
• Non-Essential Elements (Appositives): Use a pair of commas to surround information that is not required for the sentence to make sense. If you can remove the phrase and the sentence still works, use commas.
• Items in a List: Use commas to separate three or more items in a series. The ACT generally prefers the use of the serial (Oxford) comma before the final conjunction.

According to the Grammarly Guide to Commas, these marks serve as signposts for readers, preventing ambiguity. On the ACT, you will frequently see "comma splices," which occur when two independent clauses are joined by a comma alone. This is always incorrect; you must add a conjunction, use a semicolon, or create two separate sentences.

Solved Examples

Review these examples to see how ACT Comma rules are applied in practice questions.

1. Question: The scientist who won the Nobel Prize last year will speak at the graduation ceremony.
   Should there be commas around "who won the Nobel Prize last year"?
   Solution:
   1. Identify if the phrase is essential or non-essential.
   2. If we remove the phrase, the sentence becomes "The scientist will speak at the graduation ceremony."
   3. Because this phrase identifies which scientist is speaking, it is essential (restrictive).
   4. Result: No commas are needed.
2. Question: Sarah wanted to go to the beach but it started to thunder.
   How should this be punctuated?
   Solution:
   1. Identify the clauses. "Sarah wanted to go to the beach" is independent. "It started to thunder" is also independent.
   2. They are joined by the conjunction "but."
   3. Apply the FANBOYS rule: Independent Clause + , + Conjunction + Independent Clause.
   4. Result: Sarah wanted to go to the beach, but it started to thunder.
3. Question: To finish the project on time the team worked through the weekend.
   Where should the comma go?
   Solution:
   1. Identify the introductory phrase: "To finish the project on time."
   2. This is a dependent prepositional/infinitive phrase.
   3. Place a comma after the phrase to separate it from the main subject ("the team").
   4. Result: To finish the project on time, the team worked through the weekend.

Practice Questions

Apply the rules you've learned to the following practice questions. If you find these concepts challenging, you can use an AI Question Generator to create more drills tailored to your weak spots.

1. The museum features works by Monet, Renoir and Degas.

2. While the cake was baking in the oven the children cleaned up the kitchen.

3. Dr. Aris a renowned biologist discovered a new species of orchid in the rainforest.

4. The novel was long and complex yet I managed to finish it in two days.

5. My brother who lives in Chicago is coming to visit for Thanksgiving.

6. Because the store was closed we had to wait until Monday to buy the supplies.

7. The recipe calls for flour, sugar, eggs and a pinch of salt.

8. The tall, brick building on the corner was built in 1922.

9. However the results of the experiment were not what the researchers expected.

10. The athlete, tired from the race, sat down on the bench.

Answers & Explanations

1. Answer: The museum features works by Monet, Renoir, and Degas.
   Explanation: This is a list of three items. A comma is required after "Monet" and highly recommended (required by ACT standards) after "Renoir" (the Oxford comma) before the conjunction "and."
2. Answer: While the cake was baking in the oven, the children cleaned up the kitchen.
   Explanation: "While the cake was baking in the oven" is an introductory dependent clause. A comma must separate it from the main independent clause.
3. Answer: Dr. Aris, a renowned biologist, discovered a new species of orchid in the rainforest.
   Explanation: "A renowned biologist" is an appositive—a non-essential phrase that describes Dr. Aris. It must be set off with a pair of commas.
4. Answer: The novel was long and complex, yet I managed to finish it in two days.
   Explanation: This sentence joins two independent clauses with the coordinating conjunction "yet." A comma is required before "yet."
5. Answer: My brother, who lives in Chicago, is coming to visit for Thanksgiving.
   Explanation: Assuming the speaker has only one brother, "who lives in Chicago" is non-essential information. If the speaker has multiple brothers and uses the phrase to specify which one, commas would be omitted. On the ACT, usually, these are treated as non-essential unless the context dictates otherwise.
6. Answer: Because the store was closed, we had to wait until Monday to buy the supplies.
   Explanation: "Because the store was closed" is a dependent clause starting the sentence. A comma is needed before the independent clause starts.
7. Answer: The recipe calls for flour, sugar, eggs, and a pinch of salt.
   Explanation: Another list of items. Commas separate "flour," "sugar," and "eggs."
8. Answer: The tall, brick building on the corner was built in 1922.
   Explanation: "Tall" and "brick" are coordinate adjectives (you can say "tall and brick" or "brick, tall"). Therefore, they should be separated by a comma.
9. Answer: However, the results of the experiment were not what the researchers expected.
   Explanation: "However" is an introductory transition word. Transition words at the start of a sentence should be followed by a comma.
10. Answer: Correct as written.
    Explanation: "Tired from the race" is a non-essential participial phrase modifying "the athlete." The commas correctly set it off.

1. Which sentence correctly uses a comma with a coordinating conjunction?

• AI went to the store, and bought some milk.
• BI went to the store and, bought some milk.
• CI went to the store, and I bought some milk.
• DI went to the store and I bought some milk.

Frequently Asked Questions

What is the most common comma error on the ACT?

The most common error is the comma splice, where students incorrectly join two complete sentences with only a comma. To fix this, you must use a period, a semicolon, or a comma followed by a coordinating conjunction.

Does the ACT require the Oxford comma?

Yes, the ACT generally expects the use of the Oxford (serial) comma before the final "and" or "or" in a list. While some style guides make it optional, consistency on the ACT usually favors its inclusion for clarity.

When should I NOT use a comma?

You should not use a comma to separate a subject from its verb or a verb from its object. Additionally, avoid using commas before "that" in restrictive clauses or between two independent clauses without a FANBOYS conjunction.

How do I tell if a phrase is non-essential?

Read the sentence without the phrase in question; if the remaining sentence still conveys the same primary meaning and is grammatically complete, the phrase is non-essential and requires commas. If the meaning changes or becomes vague, the phrase is essential and should not have commas.

Can I use a comma before 'because'?

In most cases, you do not use a comma before "because" when it introduces a dependent clause at the end of a sentence. A comma is only used if the "because" clause is needed to prevent a specific ambiguity in the sentence's meaning.

For more practice with related topics, check out our guide on ACT Math Practice Questions or improve your logical reasoning with ACT Word Problems Practice Questions. Consistent practice is the key to mastering these rules. You can also utilize the AI Exam Simulator to take full-length practice tests that mimic the actual ACT environment.