語態有兩種：主動語態和被動語態。主語是動作的發出者時為主動語態;主語是動作的接受者時為被動語態。

注意：1)感官動詞主動語態的賓語補足語是不帶to 的不定式，變為被動語態時，該不定式前要加"to".例如：

The teacher made me go out of the classroom. 老師逼我走出教室。

——> I was made to go out of the classroom (by the teacher)。

We saw him play football on the playground. 我們看見他在草場踢球。

——> 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。例如：

Coal can be used to produce electricity for agriculture and industry. 煤可以產生工農業需要的電。