=>

1. Our children didn't do their homework last night.
2. They watched TV late at night yesterday.
3. Did your parent live here five years ago?
4. Was he at your house last weekend?
5. She bought me a new watch on my birthday last month.

1.=> Our children didn't do their homework last night.(có' last night nên ta chia ở thì QKĐ, "do" là động từ nên khi chia dạng phủ định ta dùng trợ động từ "didn't")
2.=> They watched TV late at night yesterday. ( có yesterday nên ta chia ở thì QKĐ)
3.=> Did your parent live here five years ago?( có ago nên ta chia ở thì QKĐ)

4.=> Was he at your house last weekend? ( có last weekend nên ta chia ở thì QKĐ)
5. =>She bought me a new watch on my birthday last month.( có last month nên ta chia ở thì QKĐ)

E tự làm ạ, ko coppy