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动词的语态

语态有两种：主动语态和被动语态。

主语是动作的发出者为主动语态;主语是动作的接受者为被动语态。

1)若宾语补足语是不带to 的不定式，变为被动语态　时，该不定式前要加"to"。此类动词为感官动词。

feel, hear, help, listen to, look at, make, observe, see, notice, watch

The teacher made me go out of the classroom.

--> I was made to go out of the classroom (by the teacher).

We saw him play football on the playground.

--> 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。

Coal can be used to produce electricity for agriculture and industry.

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