夜凈天明

（1）如果主語是動作的承受者，則用動詞的被動語態作謂語 （2）被動語態的構成 be + 動詞的過去分詞（p.p）...by sb

He is taken to American by he mother

（3）被動語態有各種時態

1. The information is needed by us
2. The book was being read by him 
3. The computer has been used by her
4. The room will be cleaned.
5. The computer could have been used by them

（2）被動語態和情態動詞結合:（can / could， must / have to, should / ouoght to, had better / would rather, used to / would） + be + 動詞過去分詞, need + doing/to be + 動詞過去分詞p,p

1. The food could be taken away
2. The food might be taken away
3. The food must be taken away
4. The food should be taken away
5. The food needs taking away
6. The food had better be taken away
7.Books used to be returned in two days

（3）by + 行為者

動作的行為者不分明，或不重要，或上下文中提到了行為者時，by + 行為者 可以省略

1. The information is needed
2. The book is being read
3. The door was opened

（4）被動語態的疑問句

（1）被動語態的一般疑問句： 助動詞 + 主語 + （其它助動詞） + 動詞過去分詞 ~ ？

1. Is the information needed by him? 
    Yes, It is / No, it isn't
2. Has the computer been used by her? 
    Yes, it has / No, it hasn't
3.Will the room be cleaned?
    Yes it will / No , it won't

（2）被動語態的特殊疑問句： 疑問詞 + 助動詞 + 主語 + （其它助動詞）+動詞過去分詞 ~？

1. The information is needed by them
    What is need by them?
2. The girl is taken to Shanghai
    Where is the girl taken ?
3. The book has been read three times
    How many time has the book been read?