1. Have You ever (do)done volunteer work? < hiện tại hoàn thành>  
2. Yes. I (do)did volunteer work last month. < quá khứ đơn>
3. I (collect) have collected hundreds of old books and clothes for street children so far. < hiện tại hoàn thành>
4. Linh’s brother (lose) lost his job last month. < quá khứ đơn>
 5. (see)Have you seen Mrs Chi so far? < hiện tại hoàn thành>
6, Yes, I (see)saw her at the school gate three days ago. < quá khứ đơn >
7. I (not/have)haven't had a good night sleep for a long time. < hiện tại đơn>
8. How long (know)have you known Mrs Chi? - I (know) have known her for 5 years. < quá khứ đơn>
9. We (not/see)haven't seen her since we (be) was on holiday in Ha Long Bay.< quá khứ tiếp diễn>
10. Xuan (drive ) has driven a car since he ( be ) was young, < hiện tại hoàn thành - quá khứ đơn>
11. There (be)has been no rain here since last month. < quá khứ đơn >
12. This is the first time you (be)have been here. < hiện tại hoàn thành>

1. Have you ever done volunteer work?

ever → HTHT

2. did

last month → QKĐ

3. have collected

so far → HTHT

4. lost

last month → QKĐ

5. Have you seen

so far → HTHT

6. saw

three days ago → QKĐ

7. haven't had

for a long time → HTHT

8. have you known, have known

for 5 years → HTHT

9. haven't seen, were

HTHT + since + QKĐ

10. has driven, was

HTHT + since + QKĐ

11. has been

since last month → HTHT

12. have been

This is the first time + S + have/ has + V_ed/ V3

Cấu trúc thì quá khứ đơn:

*Động từ thường:

(+) S + V_ed/ V2

(- ) S + didn't+ V_inf

(? ) Did + S + V_inf?

*Động từ tobe:

(+) S + was/ were + ...

(- ) S + was/ were + not + ...

(? ) Was/ Were + S + ...

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?