英文疑問句 | How to Form Questions in English: Complete Guide (2026)

English question formation trips up most learners in Taiwan, and the reason is structural. In Mandarin, you signal a yes/no question by adding 嗎 at the end of a sentence. In English, you flip the order of the subject and verb — or insert an auxiliary verb where there wasn’t one. That inversion rule is the engine behind nearly every English question, and once you see how it works, the rest falls into place fast.

Two Types of English Questions | 英文問句的兩大類

Every English question fits into one of two categories. Yes/No questions (是非問句) call for a simple affirmative or negative answer. WH questions (疑問詞問句) ask for specific information — a person, place, time, reason, or method. The grammar rules for building each type are slightly different, so it’s worth learning them separately before you try mixing them.

A third, less common type — the indirect question — borrows the vocabulary of direct questions but embeds them inside a polite request. All three types are covered below.

A teacher explains the rules of English question formation — yes/no questions first, then WH questions.

How to Form Yes/No Questions | 是非問句怎麼組

The formula for a yes/no question is: auxiliary verb + subject + base verb. The key move is putting the auxiliary verb in front of the subject.

There are three common situations:

• With “be” as the main verb — swap subject and verb directly:
  She is a teacher. → Is she a teacher?
  They are studying. → Are they studying?
• With an existing auxiliary (have, will, can, should, etc.) — move it to the front:
  You have finished the test. → Have you finished the test?
  She can speak French. → Can she speak French?
• With a simple present or past verb (no auxiliary) — add do/does (present) or did (past):
  He works in Taipei. → Does he work in Taipei?
  They visited Japan. → Did they visit Japan? (Note: the main verb goes back to base form)

Notice that when you add did, the main verb loses its past tense ending. This is the single most common error in written English tests: writing Did she went? instead of Did she go? The auxiliary carries the tense — the main verb resets to its base form.

For more on how auxiliary verbs behave in questions, see our guide on 英文助動詞用法：Auxiliary & Modal Verbs.

Yes/no questions use auxiliary verbs — the same ones you need for modal and helping verb structures.

The 9 WH Question Words | 9個疑問詞

WH question words tell your listener what kind of answer you’re looking for. Here are all nine, with the information each one targets:

• 誰が (誰) — a person: Who called you?
• 何 (什麼) — a thing or action: What did you eat?
• どこ (哪裡) — a place: Where do you live?
• いつ (什麼時候) — a time: When does the class start?
• なぜ (為什麼) — a reason: Why are you tired?
• Which (哪一個) — a choice from a set: Which bus goes to Taipei Main Station?
• どうやって (怎麼/如何) — a method or condition: How do you get to work?
• Whose (誰的) — ownership: Whose bag is this?
• Whom (誰 — formal object) — a person receiving an action: Whom did you call?

どうやって combines with adjectives and adverbs to create compound question words: How long, How much, How many, How often, How far, How old. These function exactly like single WH words — place them at the front of the question.

WH questions start with a question word — the rest follows the same inversion pattern as yes/no questions.

How to Form WH Questions | 疑問詞問句的結構

The structure is: WH word + auxiliary verb + subject + main verb. Think of it as a yes/no question with a WH word bolted to the front.

Take a yes/no question you already know and add the question word:

• Do you live in Taipei? → Add どこ → Where do you live?
• Does she work late? → Add なぜ → Why does she work late?
• Did they arrive? → Add いつ → When did they arrive?
• Has he been to Japan? → Add How many times → How many times has he been to Japan?

The pattern is consistent across all tenses. Past simple? Use did. Present perfect? Use have/has. Future? Use will. The WH word itself never changes.

Drilling WH question structure on paper is the fastest way to build the inversion habit.

Subject Questions: The Exception | 主語疑問句：不倒裝的情況

Here’s where most learners stall. When the WH word は the subject of the question, you do not invert — and you do not add do/does/did.

Compare these two questions about the same event:

• Who did you call? — you is the subject; who is the object → inversion required
• Who called you? — who is the subject → no inversion, no auxiliary

The same rule applies to 何 as a subject:

• What happened? ✓ (what = subject → no inversion)
• What caused the delay? ✓
• What did you say? ✓ (you = subject → inversion needed)

A quick test: replace the WH word with a regular noun and see if the sentence needs rearranging. “John called you” needs no rearranging → Who called you? No auxiliary. “You called John” → to make a question, you’d say “Did you call John?” → so WH version = Who did you call?

Subject questions are the rule most textbooks skip. Understanding them eliminates a whole category of errors.

Indirect Questions | 間接問句

An indirect question wraps a question inside a polite request or statement. The result sounds more formal or tentative — exactly what you want in business English or when speaking to someone you don’t know well.

The structure: polite opener + question word + subject + verb (no inversion).

• Direct: Where is the nearest MRT station?
• Indirect: Could you tell me where the nearest MRT station is?

• Direct: What time does the meeting start?
• Indirect: Do you know what time the meeting starts?

Notice what happens: the auxiliary (does) disappears, and the subject goes back in front of the verb. The inversion that makes a direct question is reversed in an indirect one. That’s the trap — learners who know direct questions sometimes over-apply the rule and write “Could you tell me where is the station?” That’s wrong in English. Strip out the inversion.

Common indirect question openers: Could you tell me…, Do you know…, Can you explain…, I was wondering…, I’d like to know…

Indirect questions feel more natural in professional settings — they’re a quick upgrade for business English learners.

3 Mistakes Taiwan Learners Make | 台灣學生最常犯的3個錯誤

Twenty years of teaching in Taiwan has made these three patterns predictable. They show up in writing tests, job interviews, and everyday conversation:

1. Keeping the past tense after “did”

間違っている： Did she went to school?
右： Did she go to school?
The auxiliary did carries the past tense. The main verb resets to its base form.

2. Inverting inside indirect questions

間違っている： Can you tell me where does he work?
右： Can you tell me where he works?
Once you’ve embedded a question inside a polite opener, drop the inversion. The word order returns to normal statement order.

3. Forgetting do/does in simple present questions

間違っている： She works in Taichung? (rising intonation doesn’t make it a real written question)
右： Does she work in Taichung?
In spoken Mandarin, rising intonation is enough. In written English, the auxiliary must appear.

For a related grammar area that overlaps with questions — specifically tag questions like “You’re coming, aren’t you?” — see our post on 附加問句英文：Question Tags Taiwan Learners Need.

And if you find yourself confused about when to use できる versus できた in polite questions, our guide on Can, Could or May? 英文請求與許可 covers that distinction directly.

Build the question formation habit through daily reading and deliberate writing practice.

Watch: How to Form Questions in English

This Espresso English video walks through the yes/no and WH question formulas with worked examples across multiple tenses. Worth bookmarking for review:

Quick Practice | 疑問句練習

Try converting each statement below into the correct question type. Answers follow.

1. She is from Canada. → Yes/no question
2. They left at noon. → WH question asking when
3. Someone broke the window. → Subject question asking who
4. Direct: Where does he live? → Make it indirect with “Do you know…”

Answers:

1. Is she from Canada?
2. When did they leave?
3. Who broke the window? (no auxiliary — subject question)
4. Do you know where he lives? (no inversion inside the indirect question)

Practice is the fastest shortcut here. Write five questions a day — mix yes/no with WH, try one indirect question — and within two weeks the inversion rule becomes automatic. The British Council’s interactive grammar exercises at LearnEnglish: Question Forms are a solid free resource for self-checking. For a more structured grammar reference, Cambridge Grammar: WH Questions covers the full range of question types with examples.

情報源

1. British Council LearnEnglish: Question Forms — A1–A2 grammar reference covering yes/no and WH question structures with practice exercises.
2. Cambridge Grammar: WH Questions — Authoritative reference for WH question word order, subject questions, and indirect questions with full examples.
3. Espresso English: How to Form Questions — Practical guide and video companion covering the auxiliary-inversion formula across tenses.