语态有两种:主动语态和被动语态。主语是动作的发出者时为主动语态;主语是动作的接受者时为被动语态。
注意:1)感官动词主动语态的宾语补足语是不带to 的不定式,变为被动语态时,该不定式前要加to.例如:
The teacher made me go out of the classroom. 老师逼我走出教室。
I was made to go out of the classroom (by the teacher)。
We saw him play football on the playground. 我们看见他在草场踢球。
He was seen to play football on the playground.
2)情态动词+ be +过去分词,构成被动语态。例如:
Coal can be used to produce electricity for agriculture and industry. 煤可以产生工农业需要的电。
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