1. Were we cooking when you called?
2. Had Peter written five letters by the time you came?
3. Is he going home now?
4. Will Ann be working at 3 o'clock?
5. Did he call me yesterday?
1. We were not cooking when you called.
2. Peter had not written five letters by the time you came.
3. He is not going home now.
4. Ann will not be working at 3 o'clock.
5. He did not call me yesterday