Dưới đây là các câu đã được sử dụng đúng thì của động từ trong ngoặc:

1. The telephone **rings** all the time.
2. The earth **turns** around the sun.
3. She **watched** this film last night/yesterday.
4. She **watched** this film at 8 o’clock last night.
5. She **had watched** this film before 8 o’clock last night.
6. She **has watched** this film before.
7. She felt that she **had watched** this film before.
8. He **worked** for this company 3 years ago.
9. When he was 15 years old, he usually **played** football.
10. He usually **plays** football.
11. He **went** swimming when he was a teenager.
12. Lan **has studied** English for 7 years.
13. Lan **has studied** English since 2001.
14. Lan **has studied** English since she **was** 8 years old.
15. Have you ever **traveled** to Da Lat?
16. Do you **start** work yet?
17. We **have not seen** each other up to now/up to present/so far.
18. She **recently started** her work.
19. When I **get** to the shop, it **is closed**.
20. They **eat** everything by the time I **arrive** at the party.
21. After Tom **washed** his clothes yesterday, he **began** to study.
22. He **had** dinner before she **came** yesterday.
23. Before John **went** home yesterday, he **went** to the store.
24. He **goes** out with his friends after he **finishes** his homework.
25. By the time he **arrived**, all his classmates **had left**.