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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 goodcare 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 presentfor 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 smokinga cigarette. 可改为The boy was caught smoking a cigarette.

4)在使役动词have, make, get以及感官动词see, watch, notice, hear, feel,observe等后面不定式作宾语补语时，在主动结构中不定式to要省略，但变为被动结构时，要加to。例Someone saw a stranger walkinto the building. 可改为A stranger was seen to walk into the building.

5) 有些相当于及物动词的动词词组，如“动词+介词”，“动词+副词”等，也可以用于被动结构，但要把它们看作一个整体，不能分开。其中的介词或副词也不能省略。

例The meeting is to be put offtill Friday.