Question Formation
You already know how to form Yes/No questions and Wh- questions, and you have practised getting the word order right. Now you will learn how to change statements into questions step by step, choose the correct question word, and use do, does, and did confidently.
What You'll Learn
- How to transform a statement into a question by identifying and moving the helping verb
- How to add do, does, or did when the statement has no helping verb
- How to choose the correct question word (who, what, where, when, why, which, how) based on the information you want
- How to change tense correctly when forming questions with did
When to Use
- Changing a statement into a Yes/No question: "She finished her homework." becomes "Did she finish her homework?"
- Asking about a person: "Mr Tan teaches Science." -- Ask "Who teaches Science?"
- Asking about a reason: "He was late because of the rain." -- Ask "Why was he late?"
- Asking about a choice: "She chose the blue ribbon." -- Ask "Which ribbon did she choose?"
- Asking about a quantity or degree: "The journey took two hours." -- Ask "How long did the journey take?"
How to Form
In P3, you learnt the word order for questions and the special case where "who" or "what" is the subject. Now, let us focus on the full process of transforming statements into questions.
Step-by-Step: Statement to Yes/No Question
| Step | What to Do | Example |
|---|---|---|
| 1 | Find the helping verb (is, are, was, were, has, have, can, will, shall, would, could). | "She is reading a book." |
| 2 | Move the helping verb to the front. | "Is she reading a book?" |
| 3 | If there is no helping verb, add do, does, or did. | "He likes mangoes." -- no helping verb |
| 4 | Put do/does/did at the front and change the main verb to its base form. | "Does he like mangoes?" |
Choosing Do, Does, or Did
| Tense | Subject | Helping Verb | Statement | Question |
|---|---|---|---|---|
| Present | I, you, we, they | do | They walk to school. | Do they walk to school? |
| Present | he, she, it | does | She plays the piano. | Does she play the piano? |
| Past | all subjects | did | We visited the zoo. | Did we visit the zoo? |
Key point: When you use does or did, the main verb must return to its base form (play, not plays; visit, not visited).
Step-by-Step: Statement to Wh- Question
| Step | What to Do | Example |
|---|---|---|
| 1 | Decide what information you want to ask about. | "She bought a dress." -- you want to know what. |
| 2 | Replace that information with the correct question word. | "She bought what." |
| 3 | Move the question word to the front. | "What she bought." |
| 4 | Add or move the helping verb after the question word. | "What did she buy?" (add "did", verb returns to base form) |
Choosing the Right Question Word
| Information You Want | Question Word | Example Question |
|---|---|---|
| A person | who | Who gave you that present? |
| A thing or action | what | What did they buy at the market? |
| A choice from a limited set | which | Which team won the match? |
| A place | where | Where does your grandmother live? |
| A time | when | When did the concert start? |
| A reason | why | Why did he miss the bus? |
| A manner or method | how | How does she travel to school? |
| A quantity (countable) | how many | How many books did you borrow? |
| An amount (uncountable) | how much | How much water did you drink? |
| A duration | how long | How long did the movie last? |
| A frequency | how often | How often do you visit the library? |
Key Rules
- Identify the helping verb first: If the statement already has a helping verb (is, are, was, were, has, have, can, will), move it to the front. Do not add "do/does/did" when a helping verb already exists. "She can swim." becomes "Can she swim?" (not "Does she can swim?")
- Add do/does/did only when there is no helping verb: "They play football." has no helping verb, so add "do" -- "Do they play football?"
- Match do/does/did to the tense and subject: Use does for he, she, it in the present tense. Use did for all subjects in the past tense. Use do for I, you, we, they in the present tense.
- Return the main verb to its base form: After adding do/does/did, the main verb drops its -s, -es, -ed, or irregular past form. "She cooks dinner." becomes "Does she cook dinner?" "He went home." becomes "Did he go home?"
- Use "which" for a limited choice and "what" for an open choice: "Which flavour do you want -- chocolate or vanilla?" vs "What flavour do you want?" (any flavour)
- Subject questions do not need do/does/did: When "who" or "what" is the subject, keep the normal statement word order. "Someone broke the vase." becomes "Who broke the vase?" (not "Who did break the vase?")
Common Mistakes
| Wrong | Right | Why |
|---|---|---|
| Does she goes to school by bus? | Does she go to school by bus? | After "does", the verb must be in its base form -- "go", not "goes" |
| Did he went to the hawker centre? | Did he go to the hawker centre? | After "did", the verb must be in its base form -- "go", not "went" |
| Where she did put the keys? | Where did she put the keys? | The helping verb "did" must come before the subject "she" |
| Who did call you just now? | Who called you just now? | "Who" is the subject, so no "did" is needed -- keep the normal verb form |
| What does he can do? | What can he do? | "Can" is already a helping verb -- do not add "does" as well |
| Which you prefer, tea or coffee? | Which do you prefer, tea or coffee? | A helping verb ("do") is needed after the question word |
Clue Words
Helping verbs to look for in statements:
is, am, are, was, were, has, have, had, can, could, will, would, shall, should, may, might
When you need to add a helping verb:
If the statement has only a main verb (no helping verb), add do, does, or did.
Question word phrases for specific details:
how many, how much, how often, how long, how far, what time, what kind, what colour
Tip: Use the "Underline and Replace" method -- underline the part of the statement you want to ask about, replace it with the correct question word, move the question word to the front, then add or move the helping verb. This works every time.
Practice Tips
- Transform five statements daily: Pick five sentences from your reading book and turn each one into a question. Check that you used the right helping verb and that the main verb is in its base form.
- Match the answer to the question word: Cover the question and look at the answer. If the answer names a place, the question word should be "where". If it gives a reason, use "why". If it names a number, try "how many" or "how much".
- Check for double helpers: Read your question aloud. If you hear two helping verbs together (like "does ... can" or "did ... was"), one of them should not be there. Remove the extra one.
- Spot the subject question: If the question asks who or what did the action, you do not need do/does/did. "Who painted this picture?" is correct because "who" is the doer.
Quick Reference
| Transformation | Formula | Example |
|---|---|---|
| Statement with helping verb to Yes/No | Move helping verb to front + ? | "She is cooking." becomes "Is she cooking?" |
| Statement without helping verb to Yes/No (present) | Do/Does + subject + base verb + ? | "They walk to school." becomes "Do they walk to school?" |
| Statement without helping verb to Yes/No (past) | Did + subject + base verb + ? | "He ate lunch." becomes "Did he eat lunch?" |
| Statement to Wh- question (object) | Wh-word + helping verb + subject + base verb + ? | "She bought a bag." becomes "What did she buy?" |
| Statement to Wh- question (subject) | Who/What + verb (normal form) + rest + ? | "Ali won the race." becomes "Who won the race?" |
| Statement to Wh- question (reason) | Why + helping verb + subject + base verb + ? | "He left early because he was sick." becomes "Why did he leave early?" |