Subject and Object Questions

Subject and Object Questions in English (with Clear Examples)

Some grammar topics look simple on the surface… and then quietly steal points from students in exams.

Subject and object questions are exactly like that.

Many learners know the difference between who and whom (at least in theory), but in real life — especially in B2 First and C1 Advanced — they often make one small mistake: they use inversion when they shouldn’t.

The good news? Once you understand one simple rule, this whole topic becomes easy and logical.

Let’s walk through it calmly and step by step.

The golden rule

If the question word is the SUBJECT → no inversion.

If the question word is the OBJECT → use inversion (auxiliary + subject).

Everything else is just practice.

Who and what: subject or object?

The question words who and what can be either the subject or the object of a question.

When they are the object, we use inversion (auxiliary verb + subject)

Look at these statements:

• I dropped the plate.
• I want to buy some milk.
• Now the questions:
• What did you drop?
• What do you want to buy?

Here, what is the object of the verb, so we need an auxiliary verb (did) and inversion.

When they are the subject, there is NO inversion

The word order stays the same as in a normal sentence.

• Who was swimming in the pool? → Sandra was swimming in the pool.
• Who wants to help Grandma prepare lunch? → Katy wants to help.
• What happened to you? → Nothing happened.
• What made you sad? → My dog’s death made me sad.

Notice something important:

• There is no do / does / did.
• There is no inversion.
• Because who or what is the subject.

Exam warning

Many students make this mistake:

❌ Who did break the window?

✅ Who broke the window?

If who is the subject, do not use did.

Cambridge examiners love this trap. Be smarter than the trap. 😄

Which, whose, how much, how many — subject or object?

These question phrases can also function as subjects or objects.

When they are the subject

• Which country is your favourite? → Italy is…
• Whose keys are on the desk? → My keys are…
• How much snow is expected this winter?
• How many people live in the apartment?

Here, the question phrase itself is the subject, so there is no inversion.

When they are the object

• Which house do you like more?
• Whose books are these?

(This looks like a subject question, but it isn’t. The subject is books: “These are my books.”)

• How much rain can we expect this year?
• How many children do you have?

Here, the question phrase is the object, so we use inversion.

Questions with prepositions

Subject questions with prepositions

Here, who or what is part of the subject phrase.

• Who was talking to the teacher?
• Who was walking with you?
• What shoes go with this dress?

No inversion. No auxiliary. Calm and simple.

Object questions with prepositions

In informal spoken English, the preposition usually goes at the end.

• Who were you talking to?
• Who were you walking with?
• What outfit will you wear with these shoes?

Here, who / what is the object, so we use inversion.

If you remember just one thing, remember this:

Subject = no inversion.

Object = inversion.

That single rule will save you marks in exams, mistakes in writing, and hesitation in speaking.

And that’s a very good return on a small piece of grammar.

Download Subject and Object Questions in English Exam Practice in PDF here

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