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外研2003课标版《Grammar》PPT课件优质课下载
被动语态概述
语态是动词的一种形式，用以说明主语与谓语动词之间的关系。英语的语态共有两种：主动语态和被动语态。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。被动语态是动词的一种特殊形式，一般说来，只有需要动作对象的及物动词才有被动语态。汉语往往用“被”、“受”、“给”等词来表示被动意义
2. 被动语态的构成：
被动语态的结构：主语+ be +动词过去分词(v-ed) +by sb.
情态动词的被动语态结构：主语+情态动词+ be +动词过去分词(done) +by sb.
I can find him.
He can be found by me.
情态动词的被动语态
他儿子一定照顾这个人。
His son must take care of the person.
这个人一定要由他儿子照顾=即这个人一定照顾由他儿子。
The person must be taken care of by his son.
含有情态动词的句子变为被动语态时，在情态动词后面直接加上be动词即可。
构成：主语+情态动词(can,may,must)+be(永远是原形)+过去分词+by sb.
1. You must do this as
soon as possible.
2. I can use it.
3. You should buy a
dictionary.
4. They need look after the little child.
5. We can change water into ice.
1. This must be done as
soon as possible (by you).
2. It can be used.
3. A dictionary should be bought (by you).