一、过去分词作状语的具体用法
1．作时间状语时，可转换为when或while等引导的从句，通常放在句首。如：
Seen from the top of the hill(＝ When it is seen from the top of the hill)，the school looks like a big garden.
从山顶上看，学校像一个大花园。
2．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。如：
Given more attention(＝If it was given more attention)，the fire could have been avoided.
如果多注意一下，大火或许可以避免。
3．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。如：
Encouraged(＝As she was encouraged) by the teacher，the girl was very happy.
因为受到老师的鼓励，这个女孩很开心。
4．作让步状语时，可转换为though，although 或even if引导的从句，常放在句首。如：
Left(＝Although she was left) alone at home，Jenny didn't feel afraid at all.
尽管被单独留在了家里，珍妮一点也不害怕。
5．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。如：
Surrounded by his students，the teacher went into the lab.(＝ The teacher was surrounded by his students and he went into the lab.)
老师在学生的簇拥下进入了实验室。
