Subject vs Object Questions

A2 · ElementaryQuestions

Who called you? (no 'do') vs Who did you call? (needs 'do') — the question word's role changes whether English needs an extra auxiliary at all.

What you'll learn

When the question word is the SUBJECT (the one doing the action), the word order stays like a statement — no do/does/did, no inversion
When the question word is the OBJECT (the one receiving the action), the normal inversion rule applies — add do/does/did
Compare the answer: 'Someone called you' → subject question; 'You called someone' → object question
This applies to who, what, which, and how many/how much when they ask about the subject

The one exception to the usual question rule

Every other question rule in this course adds do/does/did and inverts word order. But there's one case where none of that happens: when the question word is asking about the SUBJECT of the sentence, not the object.

"Who called you?"

"Who did you call?"

Subject questions: no 'do', no inversion

If the answer would put the question word's replacement in the subject position ('Someone called you'), the question keeps ordinary statement word order — question word + verb, exactly as if 'who' or 'what' were the subject all along.

"Who broke the window?"

"What happened?"

"Which team won the game?"

Object questions: the normal rule applies

If the answer would put the question word's replacement in the object position ('You called someone'), then the ordinary do/does/did + inversion rule from earlier lessons applies as usual.

"Who did you call?"

"What did she say?"

"Who did you invite?"

Real English

"Who lives here?"

"Who did you ask?"

"What happened to your car?"

"Which one do you prefer?"

Watch out

✗Who did call you?

✓Who called you?

When 'who' is the subject (the one calling), don't add 'did' — keep the ordinary statement word order.

✗Who you called?

✓Who did you call?

When 'who' is the object (the one being called), the normal do/does/did rule still applies.

✗What did happen?

✓What happened?

'What' is the subject of 'happened', so no 'did' is needed — just add -ed to the verb as usual.

Real life — Talking about a mystery

"Someone left this package at my door. Who sent it?"

"No idea. What does the label say?"

"Just my name and address. Who did you order anything from recently?"

"Actually... I did order something last week!"

Practice

Exercise 1 · Choose the correct question

'Who' is the SUBJECT of the answer here — choose the correct question.

Exercise 2 · Choose the correct question

'Who' is the OBJECT here — choose the correct question.

Exercise 3 · Choose the correct question

Choose the correct subject question.

Exercise 4 · Choose the correct question

Choose the correct object question.

Exercise 5 · Choose the correct question

Choose the correct subject question.

Exercise 6 · Choose the correct question

Choose the correct subject question.

Exercise 7 · Choose the correct question

Choose the correct object question.

Exercise 8 · Choose the correct question

Choose the correct subject question.

Exercise 9 · Ask about the subject

Ask about the SUBJECT: 'Someone ate the last cookie.' → (ask who)

Exercise 10 · Ask about the object

Ask about the OBJECT: 'I saw someone at the park.' → (ask who)

Exercise 11 · Sort into groups

Who fixed the car?

Who did you meet?

What made that noise?

What did you buy?

Who wrote this book?

Who did she marry?

0 / 6 sorted

Quick challenge

Five quick questions to check what stuck.

Question 1 / 5

Score: 0/0

Choose the correct question.

You learned

When the question word is the subject, use ordinary statement word order — no do/does/did.
When the question word is the object, use the normal do/does/did + inversion rule.
Check what the answer would look like to tell subject from object questions.
This applies to who, what, which, and how many/how much.

ElementaryQuestions

Question Tags

Learn how to add a short tag like 'isn't it?' or 'don't you?' to the end of a statement, flipping its polarity and matching its auxiliary.

BeginnerQuestions

Short Answers

Learn how to answer a yes/no question naturally, by echoing back the same auxiliary verb the question used.

IntermediateQuestions

Indirect and Embedded Questions

Learn how to ask polite questions and embed a question inside a sentence, using statement word order instead of inversion.

BeginnerQuestions

WH- Questions

Learn how to ask for specific information with what, where, when, why, who, and how, using the same auxiliary inversion as yes/no questions.