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语法：被动语态被动语态的用法：

一般现在时

1.的被动语态构成：is / am / are + 及物动词的过去分词

Our classroom is cleaned everyday.

I am asked to study hard.

Knives are used for cutting things.

一般过去时

的被动语态构成：was / were + 及物动词的过去分词

A new shop was built last year.

Dinosaur eggs were laid long long ago.

现在完成时

的被动语态构成：has / have + been + 及物动词的过去分词

This book has been translated into many languages.

Many man-made satellites have been sent up into space by many countries.

一般将来时

的被动语态构成：will+ be + 及物动词的过去分词

A new hospital will be built in our city.

Many more trees will be planted next year.

含有情态动词的被动语态构成：情态动词+ be + 及物动词的过去分词

Young trees must be watered often.

Your mistakes should be corrected right now.

The door may be locked inside.

Your homework can be handed in tomorrow.

现在进行时

的被动语态构成：am / is / are + being + 及物动词的过去分词

Uncle Wang is mending my bike now.→ 　　My bike is being repaired by Tom now. 　　They are planting trees over there. → 　　Trees are being planted over there by them.

不定式的

被动语态：to + be + 及物动词的过去分词

二、 怎样把主动语态改成被动语态?

There are two books to be read. → 　　There are twenty more trees to be planted.

把主动语态改为被动语态非常简单，可以遵循以下几个步骤：

先找出谓语动词;

再找出谓语动词后的宾语;

把宾语用作被动语态中的主语;

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.

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.

三、 使用被动语态应注意的几个问题：

You must lock the door when you leave.→the door must be locked when you leave. 　　

不及物动词无被动语态。

What will happen in 100 years.

The dinosaurs disappeared about 65 million years ago.

有些动词用主动形式表示被动意义。