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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。 1 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。 | 
