1.

(-)Nam didn't write an essay in literature class this morning.

(?)Did Nam write an essay in literature class this morning?

2. 

(-)I didn't watch tv yesterday morning.

(?)Did you watch tv yesterday morning?

3.

(-)Nam and you weren't in the english club last Tuesday.

(?)Were Nam and you in the english club last Tuesday?

4.

(-)They didn't eat noodles two hours ago.

(?)Did they eat noodles two hours ago?

5.

(-)We didn't always have a nice time on Christmas holiday in the past.

(?)Did you always have a nice time on Christmas holiday in the past?

6. 

(-)My father didn't decorated the Christmas tree 

(?)Did your father decorated the Christmas tree?

7.

(-)She didn't buy a new dress yesterday.

(?)Did she buy a new dress yesterday?

8.

(-)They weren't late at school.

(?) Were they late at school?

9.

(-)Mr.Tam didn't take his children to the museum last Sunday.

(?)Did mr.Tam take his children to the museum last Sunday?

10.

(-)Hoa didn't make a cushion for her armchair.

(?) Did Hoa make a cushion for her airmchair?