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.

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.
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.

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.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

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.a new sweater was bought for me by My mother last Friday.

1 the problem has been worked out by him
2 more than 100 young trees had been planted by us
3 our classroom must be kept clean and tidy by us
4 a new sweater was bought last friday by ······

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

1、The problem has worked out by him.
2、More than 100 young trees have planted by us .
3、Our classroom must keep clean and tidy by us .
4、A new sweater has bought for me by my mother

英语主动语态改为被动语态其实并不难，只要你抓准了主语、谓语、注意主语变宾格的变化，注意时态、及一些have has后面必须用系动词原型就可以了1.The problem has be worked out by him 2.More than 100 young trees have be planted by us
3..Our classroom must be keep ...

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英语主动语态改为被动语态其实并不难，只要你抓准了主语、谓语、注意主语变宾格的变化，注意时态、及一些have has后面必须用系动词原型就可以了1.The problem has be worked out by him 2.More than 100 young trees have be planted by us
3..Our classroom must be keep clean and tidy 4.Last Friday a new sweater was bring by my mother for me

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