1. 不定式的被动语态
由“to be 过去分词”构成：
He needs to be taken care of. 他需要人照顾。
Not a sound was to be heard. 听不到一点声音。
It’s better to be prepared than uNPRepared. 有准备比没有准备好。
注：有时用不定式的完成体被动式(to have been 过去分词)：
I should like to have been told the result earlier. 我本想让人把结果早点告诉我。
2. 现在分词的被动语态
由“being 过去分词”构成：
The building being repaired is our library. 正在维修的那座楼是我们的图书馆。
Being protected by a wall，he felt quite safe. 有一堵墙保护，他感到很安全。
He was seen being taken away by the police. 有人看见他被警察带走了。
注：有时用现在分词的完成体被动式(having been 过去分词)：
Having been invited to speak, I’ll start making preparations tomorrow. 因为邀请我去讲话，我明天就得做准备。
3. 动名词的被动语态
由“being 过去分词”构成：
She likes being looked at. 她喜欢被人瞧。
He objected to being treated as a child. 他反对被当成孩子看待。
This question is far from being settled. 这个问题远没解决。
4. 过去分词没有被动式
但过去分词本身可以表示被动意义：
The door remained locked. 门仍然锁着。
