6． Past Perfect Tense

主动语态： I had taught him before you came.

被动语态： He had been taught by me before you came.

一般将来时 Simple Future Tense 也常常有这种被动语态形式

主动语态： I shall teach him tomorrow.

被动语态： He will be taught by me tomorrow.

动词由主动语态变为被动语态的步骤：

1. 先找出谓语动词；　　

2. 再找出谓语动词后的宾语；　　

3. 把宾语用作被动语态中的主语；

4. 注意人称、时态和数的变化。

例：1.　Bruce writes a letter every week.

　　　　 →A letter is written by Bruce every week.

　　2.　Li Lei mended the broken bike this morning.

　　　　→The broken bike was mended by Li Lei this morning.

　　3. He has written two novels so far.

　　　　→Two novels have been written by him so far.

　　4. They will plant ten trees tomorrow.

　　　　→Ten trees will be planted by them tomorrow.

　　5. Lucy is writing a letter now.

　　→A letter is being written by Lucy now.

6. You must lock the door when you leave.

　　　　→the door must be locked when you leave.

三、 使用被动语态应注意的几个问题：

1. 不及物动词无被动语态。

What will happen in 100 years.

The dinosaurs disappeared about 65 million years ago.

2. 有些动词用主动形式表示被动意义。

This pen writes well.

This new book sells well.