I.
1. haven't had
yet → HTHT
2. didn't have
last week → QKĐ
3. is going
now → HTTD
4. moved
in 2010 → QKĐ
5. Have, visited
ever → HTHT
6. lived
when he was a student → QKĐ
7. Did, go
yesterday → QKĐ
8. has worked
since 2001 → HTHT
9. Have, seen
recently → HTHT
10. broke
two days ago → QKĐ
II.
1. was
two years ago → QKĐ
2. have been
many times → HTHT
3. will cycle
Tomorrow → TLĐ
4. is staying
At the moment → HTTD
5. didn't do
When I was young → QKĐ
6. has taught
for four years → HTHT
7. went, had
Last year → QKĐ
8. arrived
Vế trước có "could" (quá khứ của "can") → QKĐ
9. has
TLĐ + if + HTĐ
10. isn't rain
If + HTĐ + TLĐ
*Cấu trúc thì quá khứ đơn:
(+) S + V_ed/ V2
(- ) S + didn't+ V_inf
(? ) Did + S + V_inf?
*Cấu trúc thì hiện tại hoàn thành:
(+) S + has/ have + V_ed/ V3
(- ) S + has/ have + not + V_ed/ V3
(? ) Has/ Have + S + V_ed/ V3?