把下列句子变成被动语态：1Wemustwatertreeseveryday.2Hecanmendthisradio.3Weshouldnotallowthemtoworkatnight.4Theyusedictionariesintheexam.5Studentsmustcleantheirclassroomeveryday.6Theboysplantedsometrees

Question

把下列句子变成被动语态：
1 We must water trees every day.
2 He can mend this radio.
3 We should not allow them to work at night.
4 They use dictionaries in the exam.
5 Students must clean their classroom every day.
6 The boys planted some trees on the hill yesterday.
7 He can finish the work in two days by himself.
8 They write the business letters in Englsih.
9 Does he often mend his car?
10 Did you build a new house last year?
11 My sister didn't buy a new TV set last week.
12 Must I pay for it at once?

Answer 1

1 Trees must be watered by us every day.
2 This radio can be ment by him.
3 They should not be allowed to work at night.
4 Dictionaries are used by them in the exam.
5 The classroom must be cleaned by the students every day.
6 Some trees were planted on the hill by the boys yesterday.
7 The work can be finished by himself in two days.
8 The business letters are written in English by them.
9 Is his car often ment by him?
10 Was a new house built by you last year?
11 A new TV set wasn't bought by my sister last week.
12 Must it be paid for by me at once?