1. Are you inviting Tom to dinner?
Yes, I do.
2. Is she knocking at the door?
No, she isn't
3. Is Peter going to the station?
Yes, he does.
4. The secretary typed the letters today?
5. Is Ann taking the bus today?
Yes, she does.
6. Is Susan enjoying the concert?
No, she isn't.
7. Did you heard this?
Yes, I did.
8. Is Tom waiting for the bus?
No, he isn't
9. Are you wearing the new hat?
No, I don't.
10. Is Tim sailing with Paula?
Yes, he does.
11. Are they looking forward to the weekend?
Yes, they does.
12. Is Peter finishing?
Yes, he does.