How do you choose end punctuation on the ACT, including when a sentence that contains a question word still ends with a period?
End punctuation and question marks on ACT English: ending a statement with a period, a direct question with a question mark, and recognizing that an indirect question (a statement that reports a question) ends with a period, not a question mark, plus avoiding stray question marks inside statements.
A focused answer to end punctuation on ACT English: a period ends a statement, a question mark ends a direct question, and an indirect question (a statement that reports a question, often with whether or if) ends with a period, with a routine for telling a real question from a reported one in an underlined portion.
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What this skill is asking
End punctuation seems trivial, but the ACT finds a real test in it: the difference between a direct question (which ends with a question mark) and an indirect question (a statement that reports or describes a question, which ends with a period). Students over-use the question mark because the sentence contains a question word like "whether", "if", "where", or "why". The skill is to ask whether the whole sentence is asking something, or merely reporting that someone asked.
Direct versus indirect questions
The whole topic turns on one distinction, so make it precise.
The reliable test is to read the whole sentence and decide if it is asking you, the reader, anything. "Did the plan work?" asks you, so it is a question mark. "The committee wondered whether the plan worked." tells you what the committee did, so it is a period.
Spotting the indirect question
A few structural cues flag a reported question fast.
A subtler version embeds a question word inside a request that is still a direct question. "Can you tell me where the station is?" is a direct question (it asks you to tell), so it takes a question mark, even though "where the station is" looks reported. The test, again, is whether the whole sentence asks the reader something.
Choosing the end mark on an underlined portion
When the underlined portion is the end of the sentence, classify the sentence first.
Why the whole-sentence test is decisive
The reason students miss these is that they react to the question word ("why", "whether", "if") instead of the sentence's function. The fix is to step back and ask what the entire sentence does: ask the reader (question mark) or tell the reader (period). This is a small but recurring point, and it connects to the complete-sentence skill (you must see the main clause to classify the sentence) and to the run-on skill (a period is also the boundary between sentences). Getting it right is pure rule application, so it is a dependable point once the distinction is clear.
Try this
Q1. What end punctuation does an indirect question take, and what words often signal one? [Recall]
- Cue. An indirect question takes a period, because it is a statement that reports a question rather than asking one. It is often signaled by a reporting verb (asked, wondered, wanted to know) and the conjunction "whether" or "if", with statement word order.
Q2. Is "Can you tell me when the train leaves" a statement or a direct question, and what end mark does it need? [Short explanation]
- Cue. It is a direct question and needs a question mark: "Can you tell me when the train leaves?" Although "when the train leaves" looks like a reported clause, the whole sentence asks the reader to do something ("Can you tell me..."), so it functions as a question.
Exam-style practice questions
Practice questions written in the style of ACT exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
ACT English (style)1 marksChoose the best option: 'The committee wondered whether the plan would work?' (A) NO CHANGE (B) would work. (C) would work! (D) would work,Show worked answer →
The correct answer is (B), "would work.". The sentence is an indirect question: it reports that the committee wondered something, but it is a statement, not a direct question. Indirect questions end with a period, not a question mark. The word "whether" is a strong signal of a reported question.
Why not the others: (A) wrongly uses a question mark on a statement; (C) an exclamation point does not fit a neutral statement; (D) a comma cannot end the sentence. A reported (indirect) question takes a period.
ACT English (style)1 marksChoose the best option: 'Can you tell me where the library is.' as a direct request for information. (A) NO CHANGE (B) where the library is? (C) where the library is! (D) where the library is,Show worked answer →
The correct answer is (B), "where the library is?". The sentence is a direct question, it asks the reader something ("Can you tell me..."), so it must end with a question mark. Even though "where the library is" looks like a reported clause, the whole sentence is a question because it begins with "Can you".
Why not the others: (A) ends a direct question with a period; (C) an exclamation point changes the tone and is not the neutral question mark needed; (D) a comma cannot end the sentence. A direct question ends with a question mark.
Related dot points
- Complete sentences and fragments on ACT English: a clause needs a subject and a finite verb and must express a complete thought, recognizing fragments created by missing verbs, -ing verbs without a helper, and stray subordinators, and fixing an underlined portion to form a complete sentence.
A focused answer to complete sentences and fragments on ACT English: a sentence needs a subject and a finite verb and a complete thought, how fragments arise from missing or -ing verbs and stray subordinators, and how to fix an underlined portion that leaves a sentence incomplete. The foundation of the sentence-structure questions.
- Common punctuation traps on ACT English: the deliberate errors the test reuses (a comma splitting a subject and verb, a comma splice, a colon after an incomplete clause, mismatched paired marks, and the strategy of choosing the option with the fewest unjustified marks), and a unifying when-in-doubt-leave-it-out habit.
A focused answer to the recurring punctuation traps on ACT English: the subject-verb comma, the comma splice, the colon after an incomplete clause, mismatched paired marks, and over-punctuation, plus the unifying habit of choosing the option that uses no unjustified mark, with worked diagnosis.
- Run-ons and comma splices on ACT English: recognizing two independent clauses joined with no punctuation (fused) or with only a comma (splice), and applying the four standard fixes (period, semicolon, comma plus a coordinating conjunction, or subordination) to the underlined portion.
A focused answer to run-ons and comma splices on ACT English: how to recognize two independent clauses fused with no punctuation or joined with only a comma, and the four standard fixes (period, semicolon, comma plus a FANBOYS conjunction, or subordination), and how each answer choice maps to one of them.
- Colons and semicolons on ACT English: the semicolon joins two independent clauses (or separates complex list items), the colon introduces a list, explanation, or example after a complete clause, and the rule that both require a complete independent clause before them, with the contrast to a comma.
A focused answer to colons and semicolons on ACT English: the semicolon links two independent clauses, the colon introduces a list, explanation, or example after a complete clause, both need a full independent clause before them, and how each differs from a comma, with a routine for choosing the right mark.
Sources & how we know this
- Description of the ACT English Test — ACT, Inc. (2025)
- Preparing for the ACT Test — ACT, Inc. (2025)