4. Negative: They did not eat noodles two hours ago.
Interrogative: Did they eat noodles two hours ago? 
5.Negative: We did not always have a nice time on Christmas holiday in the past.
Interrogative: Did we always have a nice time on Christmas holiday in the past? 
6. Negative: My father did not decorate the Christmas tree.
Interrogative: Did my father decorate the Christmas tree?
7. Negative: She did not buy a new dress yesterday.
Interrogative: Did she buy a new dress yesterday? 
8. Negative: They were not late for school.
Interrogative: Were they late for school? 
9. Negative: Mr. Tam did not take his children to the museum last Sunday.
Interrogative: Did Mr. Tam take his children to the museum last Sunday? 
10. Negative: Hoa did not make a cushion for her armchair.
Interrogative: Did Hoa make a cushion for her armchair?