專門替中國人寫的英語語法8-3：有助動詞肯定句子的被動語氣

　　8-3 有助動詞肯定句子的被動語氣

　　在上一節(jié)，我們所有的例子都只是肯定句子，句子中沒有助動詞，可是有些肯定句子還是有助動詞的，以下是一些例子：

　　主動語氣

　　現(xiàn)在進形式 I am writing this letter.

　　現(xiàn)在完程序 I have written the letter.

　　過去進形式 I was writing the letter when you came.

　　過去完程序 I had written the letter before you came.

　　未來式 I will write the letter.

　　未來完成式 I will have written this letter.

　　未來式 I am going to see you.

　　被動語氣

　　The letter is being written by me.

　　The letter has been written by me.

　　The letter was being written by me when you came.

　　The letter had been written by me before you came.

　　The letter will be written by me.

　　This letter will have been written by me.

　　You are going to be seen by me.

　　以下是更多的例子：

　　主動語氣

　　I have seen him.

　　He is going to help you.

　　He will teach English.

　　He has helped me all my life.

　　He had called me before you came.

　　He was calling his mother when we went there.

　　被動語氣

　　He has been seen by me.

　　You are going to be helped by him.

　　English will be taught by him.

　　I have been helped by him all my life.

　　I had been called by him before you came.

　　His mother was being called by him when we went there.

　　助動詞不一定和時式有關(guān)，can、should、has to等等都是助動詞，這些助動詞在改成被動語氣的時后，都應(yīng)維持原狀，只需加入verb to be和過去分詞即可。以下是一些例子：

　　主動語氣

　　I can play the piano.

　　I may use this room.

　　He must give the book to me.

　　You should help him.

　　You have to write this letter.

　　He ought to write this report.

　　被動語氣

　　The piano can be played by me.

　　This room may be used by me.

　　The book must be given to me by him.

　　He should be helped by you.

　　This letter has to be written by you.

　　This report ought to be written by him.