Chỉ hộ vs chuyển câu chủ động thành câu bị động

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1. I am brought this dish by the waiter.
2. These postcards are sent to us by our friends.
3. The letters are sent everyday.
4. The winners are given the medals.
5. He is told to take a long rest by the doctor.
6. This plant isn't watered (by her) everyday.
7. Beer is drunk all over the world.
8. Uniform is worn to school by students.
9. Reports are sent to the manager by the secretary in the afternoon.
10. How many languages are spoken in Canada?
11. This computer isn't sold by my brother.
12. Apples are sold a lots in autumn.
13. The students are given a lot of homework by the teacher.
14. This room is kept tidy all the time.
15. Nam is asked to run in the race by Mr Ba.
16. Are the flowers watered by you?
Bị động HTĐ
(+) S is/am/are V3/ed (by O)
(-) S is/am/are (not) V3/ed (by O)
(?) Is/Am/Are S V3/ed (by O)?