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1. Letters are typed in the office by Mary. ( HTĐ) 

2. You will be helped by his father tomorrow. ( TLD) 

3. Human life has been completely changed by science and technology. (HTHT) 

4. This bottle was broken by Peter. (QKD) 

5. English is being learned in the room by them. (HTTD) 

6. My mind can't be changed .

7. I hadn't been told about it. ( QKHT) 

8. Her telephone number isn't known by me. ( HTD) 

9. The children will be brought home by my students. (TLD) 

10. I was sent a present last week. (QKD) 

11. We were given more information by her. (QKD) 

12. All the workers of the plan were being instructed by the chief engineer. ( QKTD) 

13. Tea can't be made with cold water. 

14. Some of my books have been taken away. (HTHT) 

1) Letters are typed in the office by Mary (Hiện tại đơn)
2) You will be helped by his father tomorrow (tương lai đơn)
3) Human life has completely  been changed by science and technology (hiện tại hoàn thành)
4) This bottle was broken by Peter (quá khứ đơn)
5) English is being learned in the room (hiện tại tiếp diễn)
6) My mind can't be changed (Sử dụng động từ khuyết thiếu can't)
7) I hadn't been told about it (hiện tại hoàn thành)
8) Her telephone number isn't known (Hiện tại đơn)
9) The children will be brought home by my students (tương lai đơn)
10) I was sent a present last week (quá khứ đơn)
11) We were given more information (quá khứ đơn)
12) All the workers of the plan were being instructed by the chief engineer (quá khứ tiếp diễn)
13) Tea can't be made with cold water (Sử dụng động từ khuyết thiếu can't)
14) Some of my books have been taken away (hiện tại hoàn thành).

Học tốt. Ko sao chép. Xin hay nhất!