被动语态与主动语态知识点

被动语态方面的知识

一、 被动语态的用法：
1. 一般现在时的被动语态构成：is / am / are + done
2. 一般过去时的被动语态构成：was / were + done
3. 现在完成时的被动语态构成：has / have + been + done
4. 一般将来时的被动语态构成：will+ be + done
5. 含有情态动词的被动语态构成：情态动词+ be + done
6. 现在进行时的被动语态构成：am / is / are + being + done
7. 不定式的被动语态：to + be + done
二、 怎样把主动语态改成被动语态：
1. 先找出谓语动词；
2. 再找出谓语动词后的宾语；
3. 把宾语用作被动语态中的主语；
4. 注意人称、时态和数的变化。
例：1. Bruce writes a letter every week. →A letter is written by Bruce every week.
2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning.
3. He has written two novels so far.→Two novels have been written by him so far.
4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.
5. Lucy is writing a letter now.→A letter is being written by Lucy now.
6. You must lock the door when you leave.→the door must be locked when you leave.

三、 使用被动语态应注意的问题： <