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。
(情态动词)+be+动词过去分词.构成被动语态。
we saw him play football on the playground.
He was seen to play football on the playground.(注意:宾语补足语有to时,此时to不能省略)
不及物动词,动词短语和系动词没有被动语态。当宾语是不定式时,很少用被动语态。
例如:rise:不及物动词 raise:及物动词
the price has been risen. (错)
the price has risen. (对)
the price has raised. ( 错)
the price has been raised. (对)
一般现在时:主语+am/is/are+过去分词
一般过去时:主语+was/were+过去分词
一般将来时:主语+will be+过去分词
现在进行时:主语+am/is/are+being+过去分词
过去进行时:主语+was/were+being+过去分词
现在完成时:主语+have/has+been+过去分词