被动语态通常为十种时态的被动形式,被动语态由be＋过去分词构成,be随时态的变化而变 2.被动语态的特殊结构形式
1)带情态动词的被动结构.其形式为：情态动词＋be＋过去分词.
例The baby should be taken good care of by the baby-sitter.
2) 有些动词可以有两个宾语,在用于被动结构时,可以把主动结构中的一个宾语变为主语,另一宾语仍然保留在谓语后面.通常变为主语的是间接宾语.
例His mother gave him a present for his birthday.可改为 He was given a present by his mother for his birthday.
3) 当“动词+宾语+宾语补足语”结构变为被动语态时,将宾语变为被动结构中的主语,其余不动.
例Someone caught the boy smoking a cigarette.可改为The boy was caught smoking a cigarette.
化.
