語態有兩種:
主動語態和被動語態。
主語是動作的發出者為主動語態:主語是動作的`接受者為被動語態。
1) 若賓語補足語是不帶to的不定式,變為被動語態時,該不定式前要加"to"。此類動詞為感官動詞。
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) 情態動詞+be+過去分詞,構成被動語態。
Coal can be used to produce electricity for agriculture and industry。