改为被动语态：1.He has worked out the problem.2.We have planted mor

问题描述：

改为被动语态：1.He has worked out the problem.2.We have planted more than 100 young trees.3.We must keep our classroom clean and tidy 4.My mother bought me a new sweater last Friday.

1个回答分类：英语 2014-10-03

问题解答：

我来补答

1.The problem has been worked out by him.
2.More than 100 young trees have been planted by us
3.Our classroom must be kept clean and tidy
4.I was bought a new sweater by my mother last Friday.
或是 A new sweater was bought for me by my mother last Friday

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