Object Questions and Subject Questions
Subject questions have no do/did.
Examples
- Who called you?
- Who did you call?
Key rules
- Subject questions ask about who does the action and have no do/did: Who called you?
- Object questions need an auxiliary: Who did you call?
- The answer to a subject question is the subject: Tom called me
- Use what or who as the subject
Common mistakes
- Who did call you? → Who called you?
- Who you called? → Who did you call?
💡 Tip: If who or what is the subject, do not use do or did.