What are Question Mark?
A question mark replaces a period at the end of a direct question — a sentence whose primary function is to ask something. The distinguishing feature of a direct question is inverted subject-verb word order (Is she coming? / Have you finished?) or a question word at the start (What, Who, Where, When, Why, How).
An indirect question is a question embedded inside a statement. It uses normal statement word order (subject + verb) and ends with a period, not a question mark. 'She asked whether the meeting was confirmed' contains a question as content, but the sentence is a statement — it ends with a period.
Tag questions always end with a question mark, regardless of whether the tag expects agreement or genuine information. 'You've read the report, haven't you?' ends with a question mark even though the speaker likely expects 'yes'.
Direct Questions vs Indirect Questions
The test for a question mark: is the sentence itself structured as a question? If yes, question mark. If the question is embedded inside a statement, period.
Direct question = inverted word order OR question word → question mark / Indirect question = statement word order → periodDirect Questions — Question Mark
| Question type | Word order / signal | Example |
|---|---|---|
| Yes/no question | auxiliary verb + subject | Has the report been submitted? |
| Wh- question | question word + auxiliary + subject | What caused the discrepancy in the data? |
| Tag question | statement + , tag? | The deadline is Friday, isn't it? |
| Rhetorical question (genuine) | same structure as direct question | Can we really afford to ignore this evidence? |
Indirect Questions — Period (not question mark)
| Indirect question signal | Word order | Example |
|---|---|---|
| She asked / He wondered / I need to know | subject + verb (statement order) | She asked whether the deadline had been extended. |
| The question is / The issue is | subject + verb (statement order) | The question is whether the data can be verified. |
| I wonder / She inquired | subject + verb (statement order) | I wonder if the results are ready. |
Special Cases
| Case | Punctuation | Example |
|---|---|---|
| Question at end of a quoted sentence | question mark inside closing quote | He asked, 'Is the project on track?' |
| Sentence ends with a quoted question | question mark inside; no period after | Did she really say, 'I don't care'? |
| Multiple questions in one sentence | question mark at the very end only | Should we expand the study, modify the methodology, or start again? |
| Polite request phrased as question (formal letters) | period or question mark — both acceptable | Would you kindly review the enclosed document. / Would you kindly review it? |
Key Question Mark Contexts
Indirect questions — no question mark
The most common question mark error is adding one to an indirect question because the content is a question. The test is word order: if the sentence uses statement word order (subject before verb), it is an indirect question and ends with a period.
- Direct: Were the results verified?
- Indirect: The committee asked whether the results had been verified. (period)
- Direct: What time does the session begin?
- Indirect: She needed to know what time the session began. (period)
- Direct: Can we proceed?
- Indirect: Management discussed whether they could proceed. (period)
Tag questions
A tag question adds a short interrogative clause after a statement. The tag always ends with a question mark, regardless of whether the speaker expects agreement or genuine information. The tag uses the same auxiliary as the main clause, but in reverse polarity (positive clause → negative tag; negative clause → positive tag).
- Positive → negative tag: The report was submitted on time, wasn't it?
- Negative → positive tag: They haven't confirmed the date, have they?
- No auxiliary in main clause: She works in the finance department, doesn't she?
Question Mark Warning Signals
Direct vs Indirect Question
Same content, different sentence structure — different end punctuation.
Direct question — question mark
When will the results be published?
The sentence itself is structured as a question (inverted order). Question mark.
Indirect question — period
She asked when the results would be published.
The question is embedded inside a statement. Statement word order. Period.
Common Mistakes
Question mark after an indirect question
✗ She asked whether the deadline could be extended?
She asked whether the deadline could be extended.
An indirect question is a statement, not a direct question. It ends with a period. The question mark belongs to direct questions only.
No question mark after a direct question
✗ Did you review the attached file.
Did you review the attached file?
A sentence with inverted auxiliary-subject order (Did you) is a direct question and requires a question mark.
Question mark after 'I wonder if'
✗ I wonder if the team has finished the analysis?
I wonder if the team has finished the analysis.
'I wonder if' introduces an indirect question. The sentence is a statement — it ends with a period. Only if you restructure to 'Has the team finished?' does a question mark appear.
Missing question mark on a tag question
✗ You've submitted the form, haven't you.
You've submitted the form, haven't you?
Tag questions always end with a question mark — no exceptions.
Ready to practise?
Put it into practice
Test your understanding with interactive exercises and instant feedback.