- HTĐ:
(+) He plays football.
(-) He doesn't play football.
(?) Does he play football ?
- HTTD:
(+) She is going to school.
(-) She isn't going to school.
(?) Is she going to school ?
- TLG:
(+) I am going ta visit Hanoi.
(-) I am not going to visit Hanoi.
(?) Are you going to visit Hanoi ?