Bạn tham khảo:
1. doesn't have
2. comes - is staying
3. don't drive - go
4. are you talking
5. Are you - am
6. doesn't go
7. is Mrs Loan talking
8. helps
9. isn't studying
10. are
11. sing
12. Does she play
13. is listening
14. don't always go
Thì hiện tại đơn:
(+) S + V(s,es)
(-) S + don't/ doesn't + V_nguyên thể
(?) (Wh-) + do/ does + S + V_nguyên thể?
Thì hiện tại tiếp diễn:
(+) S + am/ is/ are + V_ing
(-) S + am/ is/ are + not + V_ing
(?) (Wh-) + am/ is/ are + S + V_ing?
