Put all sentences in negative forms

I was playing football — I wasn't playing football.

1. We were having lunch when the rain started. — We [ ] having lunch when the rain started.
2. Did you work yesterday? — [ ] you work yesterday?
3. My father had already gone to cut the grass. — My father [ ] already gone to cut the grass.
4. Our daughter had graduated from the university yet. — Our daughter [ ] graduated from the university yet.
5. I made two mistakes in the test. — I [ ] two mistakes in the test.
6. Were you celebrating your birthday? — [ ] you celebrating your birthday?