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, watchThe 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.