被动语态的构成和含义
如果主语是动作的承受者, 则用动词的被动语态作谓语
be + 动词的过去分词 + by sb
He is taken to America by his mother.
被动语态的各种时态
The information is needed by us. (一般现在时)
The book was being read by him. (过去进行时)
The computer has been used by her. (现在完成时)
The room will be cleaned. (一般将来时)
The computer could have been used by them. (现在完成时)
被动语态和情态动词结合
may/maight, must/have to, should/ought to, had better/would rather, used to/would + be + 动词的过去分词
need + doing/to be + 动词的过去分词
The room may be cleaned.
The door must be locked.
The house should be furnished.
The tree had better be watered now.
被动语态和行为者
动作的行为者不明了, 不重要, 或上下文中提到了行为者时, 可以省略 by + 行为者
The information is needed.
The book is being read.
The door was opened.
被动语态的疑问句
助动词 + 主语 + 情态动词 + 动词去过分词?
Is the information needed by him?
Yes, it is.
No, it isn’t.
Has the computer been used by her?
Yes, it has.
No, it hasn’t.
Will the room be cleaned?
Yes, it will.
No, it won’t.
被动语态的特殊疑问句
疑问词 + 助动词 + 主语 + (其它助动词) + 动词的过去分词?
The information is needed by them?
What is needed by them?
The girl is taken to Shanghai?
Where is the girl taken?
The book has been read three times.
How many times has the book been read?