1. My father decorated the Christmas tree.
- My father didn't decorate the Christmas tree
? did you father decorate the Christmas tree ?

2. She bought a new dress yesterday.
- she didn't buy  a new dress yesterday
? did she buy  a new dress yesterday ?

3. They were late for school.
- they weren't  late for school
? were they  late for school ?

4. Mr. Tam took his children to the museum last Sunday.
- Mr. Tam didn't take  his children to the museum last Sunday
? did Mr. Tam take his children to the museum last Sunday?