Raising your voice at the end of a sentence is not enough to form a question in English. The structure changes: the auxiliary moves in front of the subject, and the main verb stays in its base form. From the simplest yes/no questions to question tags and indirect questions, each type has its own rules and recurring traps that even advanced learners keep falling into.
The two types of questions
Every question in English belongs to one of two groups. Closed questions (yes/no questions) expect a yes or no answer. Open questions (wh-questions) begin with a question word and expect a specific piece of information.
| Type | Structure | Example | Expected answer |
|---|---|---|---|
| Closed | Auxiliary + subject + verb | Do you speak French? | Yes, I do. / No, I don’t. |
| Open | Question word + auxiliary + subject + verb | Where do you live? | I live in Paris. |
The basic rule: subject-auxiliary inversion
To form a question, the auxiliary moves in front of the subject. If the affirmative sentence has no auxiliary, one is added: do in the present, does for the third person singular, did in the past. This auxiliary carries the tense; the main verb stays in its base form.
| Affirmative sentence | Corresponding question | Auxiliary used |
|---|---|---|
| You speak English. | Do you speak English? | do |
| She works here. | Does she work here? | does |
| They left early. | Did they leave early? | did |
| He is tired. | Is he tired? | is (direct inversion) |
| She has finished. | Has she finished? | has (direct inversion) |
| They can swim. | Can they swim? | can (direct inversion) |
The verbs to be, to have (as auxiliary) and all modals (can, will, should, must…) invert directly without needing do. Do is only used when the main verb is neither be nor an auxiliary. To be and modals never take do to form a question.
Short answers: a rule many learners overlook
In English, answering a closed question with only Yes or No is grammatically incomplete. The answer must repeat the subject and the auxiliary from the question. A bare yes or no sounds abrupt or unnatural to a native speaker.
| Question | Affirmative answer | Negative answer |
|---|---|---|
| Do you like coffee? | Yes, I do. | No, I don’t. |
| Does she work here? | Yes, she does. | No, she doesn’t. |
| Did they call? | Yes, they did. | No, they didn’t. |
| Is he ready? | Yes, he is. | No, he isn’t. |
| Can you help me? | Yes, I can. | No, I can’t. |
| Have you finished? | Yes, I have. | No, I haven’t. |
The affirmative short answer is never contracted: Yes, I am.: never Yes, I’m. The negative answer, however, always uses a contraction in spoken English: No, I don’t. rather than No, I do not.
Question words (wh-words) and their uses
Question words allow you to target a specific piece of information. They are called wh-words because most start with wh, except for how. They always go at the beginning of the question.
| Question word | Meaning | What it asks | Example |
|---|---|---|---|
| What | What | A thing or fact | What do you want? |
| Where | Where | A place | Where do you live? |
| When | When | A moment in time | When did she arrive? |
| Who | Who | A person (subject or object) | Who called you? |
| Whom | Whom | A person (object, formal) | Whom did you meet? |
| Why | Why | A reason | Why are you late? |
| Which | Which | A choice among options | Which bag is yours? |
| Whose | Whose | Ownership | Whose keys are these? |
| How | How | Manner or degree | How did you get here? |
How combines with other words to form quantity and degree questions that are very frequent in practice.
| Combination | Meaning | Example |
|---|---|---|
| How much | How much (uncountable) | How much does it cost? |
| How many | How many (countable) | How many people came? |
| How long | How long (time or length) | How long have you been waiting? |
| How far | How far away | How far is the station? |
| How often | How frequently | How often do you exercise? |
| How old | What age | How old is she? |
| What time | At what time | What time does it start? |
Who as subject: a special case
When who is the subject of the question (it is the person performing the action), there is no inversion and no do. The verb agrees as if who were a third person singular.
A reliable test: try replacing who with he or she. If the sentence works (He called you), who is the subject and there is no inversion. If you need him or her (You called him), who is the object and normal inversion applies.
Questions with modals
Modals (can, could, will, would, should, may, might, must) invert directly with the subject, with no additional auxiliary. The main verb stays in its base form.
| Modal | Question |
|---|---|
| can | Can you speak louder? |
| could | Could you help me, please? |
| will | Will you be there tomorrow? |
| would | Would you like a coffee? |
| should | Should I call him back? |
| must | Must we leave now? |
Negative questions
A negative question is formed by placing the contracted negative auxiliary at the front of the sentence. It often expresses surprise, a disappointed expectation, a mild reproach or an invitation to confirm.
If you choose the uncontracted form (Do you not…? rather than Don’t you…?), not goes after the subject. This form is more formal and places heavier emphasis on the negation: Are you not happy here?
Question tags: seeking confirmation
A question tag is a short question added to the end of a sentence to seek confirmation. The rule is consistent: an affirmative sentence takes a negative tag, a negative sentence takes an affirmative tag. In both cases, the tag repeats the auxiliary from the main clause.
| Main clause | Tag |
|---|---|
| It’s cold today, | isn’t it? |
| She works here, | doesn’t she? |
| You’ve been to Japan, | haven’t you? |
| They didn’t call, | did they? |
| You can’t drive, | can you? |
| He won’t be late, | will he? |
Intonation changes the meaning of a question tag. With falling intonation, the speaker is simply confirming what they already believe. With rising intonation, the question is genuine and the speaker is not sure of the answer.
Indirect questions
An indirect question is embedded inside a longer sentence. It softens a request or expresses uncertainty. Inside this structure, word order returns to that of an affirmative sentence: no inversion, no do/does/did.
| Direct question | Indirect question |
|---|---|
| Where is the station? | Could you tell me where the station is? |
| What time does it start? | Do you know what time it starts? |
| Did she call? | I wonder if she called. |
| Why did he leave? | I don’t know why he left. |
| Is he coming? | Can you tell me if he is coming? |
For indirect questions based on a yes/no question, the question word is replaced by if or whether: Do you know if she speaks English? / I’m not sure whether they’ve arrived.
Present perfect vs past simple questions
These two tenses are often confused in questions. In the present perfect, the question is formed with Have/Has before the subject. In the past simple, Did inverts with the subject.
| Tense | Structure | Example |
|---|---|---|
| Present perfect | Have/Has + subject + past participle | Have you ever been to London? |
| Present perfect | How long + have/has + subject + past participle | How long have you worked here? |
| Past simple | Did + subject + base form | Did you see her yesterday? |
| Past simple (be) | Was/Were + subject | Were you at the party? |
A quick decision rule: if a specific time marker is in the question (yesterday, last week, in 2020), use the past simple. If the question is about an experience with no precise date, or about a duration that is still ongoing, use the present perfect.
Summary table of question structures
| Question type | Structure | Example |
|---|---|---|
| Closed (present simple) | Do/Does + subject + verb | Does she like tea? |
| Closed (past simple) | Did + subject + verb | Did you call him? |
| Closed (be) | Am/Is/Are/Was/Were + subject | Are they ready? |
| Closed (modal) | Modal + subject + verb | Can she drive? |
| Open | Wh-word + auxiliary + subject + verb | Where do you work? |
| Open (subject = wh) | Who/What + verb | Who called? |
| Negative question | Contracted negative auxiliary + subject + verb | Don’t you know him? |
| Question tag | Sentence + , auxiliary + pronoun? | You know her, don’t you? |
| Indirect | Sentence + question word + subject + verb | I don’t know where he lives. |
Practice quiz
Test your knowledge of question structures in English:
1. Which question is correctly formed in the present simple?
2. How do you correctly answer “Did you call her?”
3. Which sentence correctly shows who used as the subject?
4. Which question tag correctly completes “She doesn’t know, ___ ?”
5. Which indirect question is correctly formed?
6. Which question correctly asks about a past experience using the present perfect?
7. Which sentence is the most polite and correctly formed indirect question asking for the time?
