1. 

(-): Mai does not brush her teeth twice a day

(?): Does Mai brush her teeth several times a day?

2.

(-): Ba and Lan do not often go to the zoo

(?): Do Ba and Lan often go to the zoo?

3.

(-): I never play sports

(?): Do you ever play sports?

4. 

(-): He isn't listening to music now

(?): What is he doing?

5.

(-): She never has a picnic

(?): Does she ever has a picnic?

6.

(-): They never go camping on Sundays

(?): Do they often go camping on Sundays?

7.

(-): Nam never goes to the park

(?): Does Nam often come to the park?

8.

(-): She never has some orange juice after lunch

(?): Does she has some orange juice after lunch?

9.

(-): We never has some bananas

(?): Do we sometimes has some bananas?

Còn câu 10 mình nhìn không rõ á, cậu tự làm nha. Cho mình ctlhn nhé! Học tốt.