Common Usage & Traps
- 你是谁? — Who are you?
- 谁说的? — Who said that?
- 这是谁的? — Whose is this?
- 谁知道? — Who knows?
- 谁来了? — Who came?
- 谁看见我的猫了? — Who saw my cat?
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谁是你?你是谁?English puts 'who' first, but Chinese keeps it where the answer would go. 谁是你 sounds like 'Who is you?'
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这是谁书?这是谁的书?You need 的 to turn 谁 into 'whose'. Without it, it sounds like 'this is who book?'