过去分词作状语：

1.条件状语

（1）Given more time we could do it much better.

作条件状语相当于if/unless引导的条件状从。

If we were given more time…

2.时间状语

Asked why he was late,the boy made no answer.

作时间状语相当于when/while等引导的时间状从。

When he was asked why he was late,the boy made no answer.

3.原因状语

Encouraged by the teacher’s words, he went on with his research work.

作原因状语相当于as/since/because引导的原因状从

Because he was encouraged by….

4.让步状语

Laughed at by many people,

he continued his study.

作让步状语相当于though/although/even if引导的让步状从。

Though he was laughed at by…

5.方式或伴随状语

The old man went into the room,supported by his wife.

Seated at the table,my father and I were talking about my job.

The teacher stood there surrounded by many students.(表伴随，无连词相通）