1.何時運用被動語態(tài)：

　　(1)強調(diào)動作的接受者：America was discovered by Columbus.

　　(2)不知誰是動作的執(zhí)行者：You are wanted on the phone.

　　(3)作客觀說明：It is said that the meeting has been put off.(經(jīng)典句型)

　　2.主動變被動的基本方法：(說起來容易，掌握起來需要用心!)

　　(1)主動語態(tài)中的賓語變?yōu)楸粍诱Z態(tài)的主語。

　　(2)謂語動詞變?yōu)橛?ldquo;be + 過去分詞”的形式，配合時態(tài)作相應(yīng)變化。

　　(3)主動語態(tài)主語置于介詞 by之后，如無必需，則省略。

　　(4)不及物動詞沒有被動語態(tài)。

　　現(xiàn) 在 do (does) →am / is / are + done

　　We keep the piano in the living-room.

　　→The piano is kept in the living-room.

　　過 去 did→was / were + done

　　They built the bridge in 1980.

　　→The bridge was built in 1980.

　　將 來 shall shall

　　will do → will + be + done

　　He will read the book tomorrow.

　　→The book will be read tomorrow.

　　現(xiàn)在完成 have have

　　has done → has + been + done

　　We have delivered the newspaper.

　　→The newspapers have been delivered (by us).

　　過去完成 had done → had been done

　　She had seen the film before she came here.

　　→The film had been seen before she came here.

　　將來完成 shall shall

　　will have done → will have + been + done

　　By the end of this term we shall have finished 80 texts.

　　→By the end of this term 80 texts will have been finished.

　　現(xiàn)在進行 am am

　　is doing → is + being + done

　　are are

　　They are drawing the picture.

　　→The picture is being drawn by them.

　　過去進行 was doing → was + being + done

　　were were

　　He was reviewing their lessons at this moment yesterday.

　　→Their lessons were being reviewed at this moment yesterday.

　　情態(tài)動詞 may may

　　can can

　　must must

　　should do → should + be + done

　　ought to ought to

　　used to used to

　　You must write an article on the subject.

　　→An article must be written on the subject.

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