How to Form Questions in English: Yes/No, Wh-, and Tag Questions

Q: Why don't indirect questions use inversion?

Indirect questions are embedded inside a larger sentence and follow normal statement word order. 'Can you tell me where the office is?' — the indirect clause 'where the office is' acts like a noun phrase, not a direct question.

Q: What is the difference between 'do you know' and 'do you know if' in indirect questions?

When the original question is a yes/no question, use 'if' or 'whether': 'Is she coming?' becomes 'Do you know if she is coming?' When the original has a wh- word, keep it: 'Where does he live?' becomes 'Do you know where he lives?' Both use normal word order.

Q: How does intonation change the meaning of a tag question?

With rising intonation, the speaker genuinely doesn't know and is asking for information. With falling intonation, the speaker is fairly certain and seeking agreement. Getting this intonation right makes your English sound much more natural.

Q: When do I use 'do' vs 'does' vs 'did' to form questions?

Use 'do' for present simple questions with I/you/we/they. Use 'does' for he/she/it. Use 'did' for all persons in the past simple. After did, the main verb always returns to its base form.

Q: How do you form questions with modal verbs?

Modal verbs (can, could, will, would, should, must) are auxiliaries, so simply invert them with the subject. 'You can swim' becomes 'Can you swim?' No do/does/did is added.

Q: What is the tag question for 'I am right'?

The tag for 'I am right' is 'aren't I?' — not 'amn't I?' This is the accepted conversational form in both British and American English.

Grammar Questions LexFizz Team 10 min read 10 June 2026

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Key Takeaways

English forms yes/no questions by inverting the subject and auxiliary verb: She is happy → Is she happy?
Wh- questions use a question word (who, what, where, when, why, how) followed by the same inversion pattern.
Tag questions confirm or check information: a positive statement takes a negative tag, and vice versa.
Indirect questions use normal word order (no inversion) after a reporting phrase: Can you tell me where she lives?
Intonation matters: rising intonation for yes/no questions, falling intonation for most wh- questions.

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Asking questions is one of the most fundamental communicative acts in any language — and in English, forming them correctly requires understanding a set of rules that go beyond simply putting a question mark at the end of a sentence. English uses subject-auxiliary inversion, a system where the auxiliary verb jumps in front of the subject to signal a question. This guide covers every major question type: yes/no, wh-, tag, and indirect questions, plus tips on rising and falling intonation.

Yes/No Questions

Yes/no questions expect either yes or no as an answer. They are formed by placing the auxiliary verb before the subject.

Form: Auxiliary + Subject + Main Verb + ?

If the sentence has a modal or auxiliary verb, move that to the front. If it uses be as the main verb, invert it. If there is no auxiliary, use do/does/did.

She is a teacher. → Is she a teacher?

They have finished. → Have they finished?

He works here. → Does he work here?

She called yesterday. → Did she call yesterday?

Common Mistake

Adding do unnecessarily when an auxiliary already exists:
✗ Do she is happy? ✓ Is she happy?

Wh- Questions

Wh- questions ask for specific information. They begin with a question word followed by the same inverted structure as yes/no questions.

Question word	Asks about	Example
Who	Person (subject)	Who called you?
Whom	Person (object, formal)	Whom did you call?
What	Thing / action	What are you doing?
Which	Choice from a set	Which book do you prefer?
Where	Place	Where does she live?
When	Time	When did they arrive?
Why	Reason	Why are you laughing?
How	Manner / degree	How did you find out?
How much/many	Quantity	How many students are there?
How long	Duration	How long have you been waiting?

Subject questions vs. Object questions

When the question word is the subject of the sentence, no auxiliary inversion is needed because the question word itself fills the subject slot:

Who wrote this letter? (who = subject — no did)

What happened? (what = subject — no did)

Who did wrote this letter? (incorrect — double subject)

When the question word is the object, inversion is required:

Who did you invite? (you = subject; who = object)

Tag Questions

Tag questions (also called question tags) are short questions added to the end of a statement to seek confirmation, agreement, or clarification. The rule is: a positive statement takes a negative tag, and a negative statement takes a positive tag.

Form: Statement, auxiliary + n't + pronoun? / Statement, auxiliary + pronoun?

It's a lovely day, isn't it? (positive → negative tag)

You haven't eaten, have you? (negative → positive tag)

She can drive, can't she?

They didn't call, did they?

Special cases to remember: I am right, aren't I? (not amn't I) and imperatives often use will you? or won't you?: Open the window, will you?

Indirect Questions

Indirect questions are more formal and polite. They are embedded inside another question or statement using a reporting phrase. Crucially, indirect questions do not invert the subject and verb — they use normal statement word order.

Form: Reporting phrase + question word / if / whether + normal word order (no inversion)

Can you tell me where the station is? (not where is the station)

Do you know what time it starts?

I was wondering if you could help me.

Could you explain why you were late?

Common Mistake

Inverting the verb inside an indirect question:
✗ Can you tell me where is the station?
✓ Can you tell me where the station is?

Rising and Falling Intonation

Intonation changes the meaning of a question. In English:

Yes/No questions typically use rising intonation at the end: Are you coming? (voice rises)
Wh- questions typically use falling intonation: Where do you live? (voice falls)
Tag questions change meaning with intonation:
- Rising tag = genuinely unsure, seeking information: She's a doctor, isn't she? (rising)
- Falling tag = expecting agreement: Nice weather, isn't it? (falling)

Learners who apply their first-language intonation patterns to English questions are often misunderstood. Practise by listening to native speakers and recording yourself.

Common Mistakes in Question Formation

Forgetting do/does/did: ✗ You like coffee? ✓ Do you like coffee?
Using an infinitive instead of base form after did: ✗ Did she went? ✓ Did she go?
Inverting in indirect questions: ✗ I wonder what is she doing. ✓ I wonder what she is doing.
Wrong pronoun in tag question: ✗ She's tired, isn't her? ✓ She's tired, isn't she?
Using same auxiliary in tag when there is none in the statement: add do/does/did: You live here, don't you?

Practise Question Formation

Reading rules is only the first step — fluency comes through consistent practice. Try these free LexFizz exercises to test your understanding:

Grammar Quiz — multiple-choice questions on auxiliary verbs and question structures.
Complete the Sentence — form correct questions from given prompts.
True or False — identify whether question structures are correct.
Flash Cards — review question word meanings and patterns.

Test your question formation skills

30 free interactive grammar exercises — no sign-up required.

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Frequently Asked Questions

How do you form a yes/no question in English?

Move the auxiliary verb (be, have, can, will, do/does/did) in front of the subject. For example: "She is coming" becomes "Is she coming?" If the sentence has no auxiliary, add do, does, or did: "You like jazz" becomes "Do you like jazz?" Remember that the main verb stays in its base form after did.

What is the difference between a subject question and an object question?

In a subject question, the question word (who, what) replaces the subject, so no auxiliary inversion is needed: "Who called you?" (who = subject). In an object question, the question word replaces the object, so inversion is required: "Who did you call?" (you = subject, who = object). The easiest test is to ask whether the question word is doing the action (subject) or receiving it (object).

How do tag questions work in English?

Tag questions are mini questions added to a statement to seek agreement or confirmation. The rule: positive statement + negative tag (She's a nurse, isn't she?); negative statement + positive tag (You haven't eaten, have you?). Always match the auxiliary in the tag to the auxiliary in the statement, and use a pronoun that refers back to the subject.

Why don't indirect questions use inversion?

Indirect questions are embedded inside a larger sentence. Because they are not the main question — the outer reporting phrase is — they follow normal statement word order. "Can you tell me where the office is?" The main question is "Can you tell me...?" and the indirect clause "where the office is" acts like a noun phrase, not a direct question.

What are the most common wh- question words in English?

The core wh- words are: who (person), what (thing/action), where (place), when (time), why (reason), which (choice), how (manner). Extended forms include how much, how many, how long, how often, how far, and how old. "Whose" asks about possession: "Whose bag is this?" All of these can introduce direct or indirect questions.

What is the difference between "do you know" and "do you know if" in indirect questions?

When the original question is a yes/no question, use "if" or "whether" to introduce the indirect version: "Is she coming?" becomes "Do you know if she is coming?" When the original has a wh- word, keep that word: "Where does he live?" becomes "Do you know where he lives?" Both indirect forms use normal word order (no inversion after if/whether/wh-).

How does intonation change the meaning of a tag question?

With rising intonation on the tag, the speaker genuinely doesn't know the answer and is asking for information: "She passed the exam, didn't she?" (unsure, really asking). With falling intonation, the speaker is fairly certain and seeking agreement: "Beautiful day, isn't it?" (expecting yes). Getting this intonation right makes your English sound much more natural.

When do I use "do" vs "does" vs "did" to form questions?

Use "do" for present simple questions with I/you/we/they: "Do you speak French?" Use "does" for he/she/it: "Does she work here?" Use "did" for all persons in the past simple: "Did they arrive on time?" After did, the main verb always returns to its base form — never the past form: "Did she go?" not "Did she went?"

How do you form questions with modal verbs?

Modal verbs (can, could, will, would, should, must, might, may) are already auxiliaries, so you simply invert them with the subject. "You can swim" becomes "Can you swim?" "She should leave" becomes "Should she leave?" No "do/does/did" is added. Negative questions use the contracted form: "Can't you come?" or the full form "Can you not come?"

What is the tag question for "I am right"?

The tag for "I am right" is "aren't I?" — not "amn't I?" (which is not standard in most varieties of English) and not "am I not?" (which sounds very formal and dated). "I am right, aren't I?" is the accepted conversational form in both British and American English. In very formal written style, "am I not?" is occasionally seen.