①基本结构：

　　肯定句式：be +done (及物动词的过去分词)

　　如果是不及物动词 + 相应的介词或副词

　　否定句式：be +not +done

　　疑问句式：be动词（情态动词）放句首

　　被动语态中的be为助动词，无意义。be可能是am ， is ， are也可能是was ，were或原形be。

　　注：☆被动语态的时态是由be的时态决定的，be是什么时态，全句就是什么时态，be后面的过去分词不变。

　　Eg：

　　1.The song is liked by young people.  (肯定句)

　　2.The song isn’t liked by young people.（否定句）

　　3. Is the song liked by young people ？（一般疑问句）

　　4.Who is the song liked by ？=By whom is the song liked？（特殊疑问句）

　　②各种时态的构成（动词以do为例）：

　　→一般现在时

　　动词的被动形式：am/is /are done

　　例句：He is asked to do this.

　　→一般过去时

　　动词的被动形式：was/were done

　　例句：The story was told by her mother.

　　→一般将来时

　　动词的被动形式：will /shall   be done

　　Is/are going to

　　例句：The problem will be discussed tomorrow.

　　→过去将来时

　　动词的被动形式：should/would  be done

　　Was/were are going to

　　例句：He said the trees would be planted soon.

　　→现在进行时

　　动词的被动形式：am/is/are being done

　　例句：The novel is being written.

　　→过去进行时

　　动词的被动形式：was/were being done

　　例句：At that time the desk was being made.

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