小学英语语法知识点：动词的语态概述
小学英语语法知识点：动词的语态概述语态有两种：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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