GHi rõ giải thích 1. John __(play)__ tennis once or twice a week. 2. At 5 o’clock yesterday evening, I _(iron)__ my clothes. 3. She ___( learn )___ German for two years. 4. My grandfather __( die )___ many years ago 5. She ___(work)__ in the office while her son__(read)__ books 6. If she __(be)__ unhappy, She __(go)__shopping. 7. They __ (not meet) __their parents since last week 8.. The boys broke a window when they __( play )___ football 9.. Each student .... _( understand).. the lesson very well 10. My mother__(cook)__ dinner at the present. 11. We (not-be)…..able to get in touch with Mr Reese last night. 12 .My brother (be)……in London from 1950 to 1955 13.. .......you (be) to china? 13. two men (be) …very poor a year ago. 14. Helen and I (talk) ….on the telephone yesterday. 15. We …..(just/ build) a new house for our mother. 16. These people sometimes (go) ….to school by bus. 17. I (stay)…at.home and (write)….several letters last night. 18. Nam and Lan occasionally (go) ….to the cinema on Fridays. 19. Tom (not speak)…..English very well. 20. Helen (be) ….absent from school yesterday. 21. He (not, be) …………at home every Sunday. 22. The bus always (stop) .....there 23. My students ........(be) absent from class tomorrow because they haven’t been better afer illness. 24. John ( finish )………… this letter for 2 hours. ong mn giúp mik vs cần gấp ạ