1)Must we call the police?
Yes, we must.
2) Did they have many toys?
Yes, they did.
3) Are you going to invite the Browns?
Yes, I am.
4) Does he go there?
Yes, he does.
5) Did they find a coin there?
Yes, they did,
6) Was a coin there?
Yes, it was.
7) Did it take an hour...?
Yes, it did.
8) Is she clever?
Yes, she is.