2 (-) The children are not doing their homework.

(?) Are the children doing the homework?

3 (-) I am not playing chess now 

(?) Am I playing chess now ?

4 (-) she does not teach English  every day

(?) Does she teach English every day ?

5 (-) They don not go to work by buy every morning

(?) Do they go to work by buy every morning ?

6 (-)Tom does not watch TV every evening

(?) Does Tom watch TV every evening ?

7 ( -) the students do not take a bus to school

(?) Do the students take a bus to school every morning ?

8 They are not having dinner now 

(?) Are they having dinner now ?

9 (-)She is not reading a book at the moment 

(?) Is she reading a book at the moment ?

10 (-) she does not study Vietnamese every evening 

(?) Does she study Vietnamese every evening ?

Sử dụng phủ định và nghi vấn HTĐ

(-) S +do not/does not + VO...

        + is not /am not/ are not + Vo...

(?)Do/Does + s + Vo......?

   Am/Is /Are + S + Vo...?

sử dụng phủ định và nghi vấn của HTTD

(-) S + am not /is not/ are not + V-ing...

(?) Am/Is /Are + S + V-ing.....?