Grammar

第55课 被动语态（一）

一、语态是动词的一种形式，表示句中主语和谓语动词表示的动作之间的关系。主动语态表示主语是动作的执行者，被动语态表示主语是动作的承受者。

二、基本结构及用法

1.结构： be +及物动词的过去分词

2.用法：当我们不知道动作的执行者是谁、动作的执行者不需要提及或需要强调动作的承受者时，通常用被动语态。

三、一般现在时的被动语态

其基本结构为"主语+ is / am / are +动词的过去分词"。

例如：Many trees are planted every years.

四、一般过去时的被动语态

其基本结构为"主语+ was / were +动词的过去分词"。

例如：Many trees were planted last year.

五、主动语态变被动语态

They planted many trees last year.主动语态)

Many trees were planted by them last year.(被动语态)

六、练习

句型转换

1. He bought a new computer last week.（改为被动语态）

A new computer ________ ________ ________ him last week.

2. She often draws pictures. （改为被动语态）

Pictures _______ often _______ _______ her.

3.Many trees are planted every year.(改为主动语态)

People ______ many trees every year.

参考答案：1. was bought by 2.are drawn by 3. plant

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