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.