Giải thích các bước giải:
I. (Bị động thì hiện tại đơn)
1. The pictures are drawn in the room.
+ S + is/am/are + PII + (by O)
2. The meal is never cooked for herself by Lan.
+ S + is/am/are + PII + (by O)
3. The room isn't cleaned everyday.
+ S + is/am/are (not) + PII + (by O)
4. The flowers aren't often watered by him.
+ S + is/am/are (not) + PII + (by O)
5. Are you always taken to the zoo by your parents?
+ Is/am/are + S + PII + (by O)?
6. Is tennis played by her everyday?
+ Is/am/are +S + PII + (by O)?
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II. (Bị động thì quá khứ đơn)
1. That novel was bought by Mr. Allen in 1998.
+ S + was/were + PII + (by O)
2. A new car wasn't bought last month.
+ S + was/were (not) + PII + (by O)
3. Were many mistakes made in your test?
+ Was/Were + S + PII + (by O) ?
4. The housework wasn't done by her yesterday.
+ S + was/were (not) + PII + (by O)
5. Why were they helped by Nam?
+ Why + Was/Were + S + PII + (by O) ?