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
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
短语动词的被动语态短语动词是一个整体,不可丢掉后面的介词或副词
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