Passive voice : 1.Passengers shouldn't throw away their tickets 2.Candidates may not use dictionaries 3.A machine could do this much more easily 4.You must keep your dogs in the garden 5.Has someone posted my parcel? 6.Who broke this window? 7.They were playing chess at 8 p.m last night 8.Someone ought to repair this window. Put the verb in brackets into the correct tense 1.In France birds (fly)____to the South before winter comes 2.The performance (begin)____at 7 o'clock and (last)_____for three hours.We all (enjoy)_____it

Cách làm:
- Ta cần chuyển câu từ dạng Active sang dạng Passive bằng cách đổi vị trí động từ và chủ ngữ.
- Nếu có động từ to be trong câu Active, chúng ta sẽ giữ nguyên động từ đó.
- Chú ý đến thì, dạng động từ phải phù hợp với thì của câu gốc.

Câu trả lời:
1. Birds are flown to the South before winter comes in France.
2. The performance is begun at 7 o'clock and is lasted for three hours. We all enjoyed it.

10. This window ought to be repaired by someone.

9. Your dogs must be kept in the garden.

8. Chess was being played by them at 8 p.m last night.

7. Who broke this window?