动词的语态

　　动词的语态

　　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.

　　1 let 的用法

　　1)当let后只有一个单音节动词，变被动语态时，可用不带to 的不定式。

　　They let the strange go.---> The strange was let go.

　　2) 若let 后宾补较长时，let 通常不用被动语态，而用allow或permit 代替。

　　The nurse let me go to see my classmate in the hospital.

　　----> I was allowed / permitted to see my classmate in the hospital.