1、作时间状语，可以转化为when、while等引导的时间状语从句。2、作让步状语，可转换为though、although或even if引导的从句，常放在句首。3、作条件状语时，可转换为once、if或unless等引导的从句，一般放在句首。4、作方式或伴随状语时，常可转换为并列分句，可位于句首或句末。5、作原因状语时，可转换为because、as或since等引导的从句，多放在句首。

相关例句：1、Seen from the top of the hill(=When it is seen from the top of the hill),the school looks like a big garden.

从山顶往下看，这学校像一座大花园。

2、Left(=Although she was left)alone at home,Jenny didn’t feel afraid at all.

尽管只有一个人在家，珍妮一点也不害怕。

3、Given more attention(=If it was given more attention),the fire could have been avoided.

如果更加小心谨慎些，可能能避免这场火灾。

4、Surrounded by his students,the teacher went into the lab.(=The teacher was surrounded by his students and he went into the lab.)

这位老师和他的学生一起走进了实验室。

5、Encouraged(=As she was encouraged)by the teacher,the girl was very happy.

由于受到老师的鼓励，女孩很高兴。