:
2） 带不定式的被动结构：The room is going to be painted.
The homework needs to be done with care.
3) 短语动词的被动：
a.（不及物）动词+介词：若这类短语动词是及物性的，则可用于被动语态中，如：laugh at, look after, talk about, think of 等。若这类短语动词是不及物性的则不可用于被动语态中，如：book up, look down. 等
b.（及物）动词+副词：bring about, carry out, find out, make out, put away, put off, take up, turn down, turn out, wipe out等
c. 动词+副词 +介词：do away with, face up to, give into ,look down upon, make up with等
d. 动词+名词+介词：catch sight of, keep on eye on, make a fool of , pay attention to , put an end to , set fire/light to , take notice of 等
4) 带复合宾语的动词在改为被动语态时，一般把主动结构中的宾语改为主语，宾语补足语保留在谓语后面。We always keep the classroom clean.
(比较：The classroom is always kept clean.)
5)主动形式表示被动意义的词。常见的有：
a.主动形式，这时动名词同句中的主语有动宾关系。
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