1. We saw Mr Zhang just now.
We didn't see Mr.Zhang just now.
Did you see Mr.Zhang just now? Yes, we did. No, we didn't.
Whom did you see just now?
2. He teaches us English every day.
He doesn't teach us English every day.
Does he teach you English every day? Yes, he does. No, he does't.
What does he teach you every day?
3. There is a bag on the desk.
There isn't a bag on the desk.
Is there a bag on the desk? Yes, there is. No, there isn't.
What' s on the desk?
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