小升初英语语法复习：动词的语态

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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, mak英语e, 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.