怎样判断是不是过去分词作状语

这是非谓语动词作状语,这个动作与主句的主语相关,
--ing 与主句主语构成主动关系
--ed 与主句主语构成被动关系
to do 与主句主语构成目的关系
如: Glancing at the bits of wood and metal that lay around him,the man sadly picked up the mattress and carried it into hes house. 男人看了一眼周围的碎木片和碎金属片,伤心地捡起了床垫,把它拿进了屋.
Turning to the left ,you'll find the station. 往左转,你会发现车站.
Seen from the top of the hill, the city looks more beautiful to us. 这里的see 与主语the city 构成被动关系,所以用seen. 从山顶看下去,这座城市看起来更加美.