Chia dạng đúng của động từ trong ngoặc, dựa vào các thì động từ đã học ở trên. Exercise 5: 1. I (not hear) from him since he (disappear) two years ago. 2. After the guests (leave) _____, she (go) ____back into the living-room and (turn) _____ off the light. 3. By the time you finished cooking they (do) their homework. 4. This time yesterday they (sit) in the train on their way to Paris. 5. I came late to class. When I (enter) the teacher (write) something on the blackboard. 6. She (get) into her shoes, (put) on her coat and (go) to the door. 7. David (be) born after his father (die) 8. When I (be) a child, I (want) to be a doctor. 9. At 4 p.m. yesterday? Well, I (work) in my office at that time. 10. The audience (listen) to everything he said last night. 11. Yesterday thieves (break) into the house and (steal) a lot of fur coats while the guests (dance) 12. He (do) his homework before he went to the cinema. 13. What you (do) after you (go) home yesterday? 14. Tom (not come) here tomorrow. 15. John (watch) TV at 8 last evening. 16. Dick (start) school before he (be) seven. 17. What you (do) when I (ring) you last night? 18. John (drive) that car ever since I (know) him. 19. Columbus (discover) America more than 400 years ago. 20. When the teacher came in, the pupils (play) games