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把下面句子变成被动语态

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把下面句子变成被动语态
1.We often use a recorder in our class.
2.The workers built a tall building last year.
3.We will finish the work soon.
4.They are discussing the problem.
把下面句子变成被动语态
1.A recorder is often used by us in our class.
2.A tall building was built by workers last year.
3.The work will be finished by us soon.
4.The problem is being discussed by us.