Seen on top of the mountain,the city looks more be

Seen on top of the mountain,the city looks more be

1.seen 可以理解成“被看”,它与后面的主语the city 存在着被动的关系,所以用过去分词形式.（过去分词表示被动,完成.）2.Considering his age,the little boy read quite well.这个句子中Considering是介词,Considering his age是介词短语在句中作状语.比如：Considering the distance,he arrived very quickly.考虑到路程较远,他来得够快了.Considering everything,this is the best choice.考虑到各种情况,这是最佳选择.3.Judging from the appearance,it is very peaceful.这一句中,Judging from（by） 由……判断出,这是现在分词作独立成分,在此并非句子的状语.作独立成分的现在分词还有：generally speaking 一般来说.======以下答案可供参考======供参考答案1:语法书上讲是独立主格结构。供参考答案2:你这个问题提得好！Considering his age 和Judging from 此类短语，要看着独立成分，做插入语，而非句子的状语。供参考答案3:其实道理很简单，你只要看前后两句的主语是否一致，如果是一致的就要看是被动还是主动，主动用现在时，被动则过去分词，至于时态就要视情况而定了。如：having finished his work，tom is to play basketball。如果主语不一致，肯定就是独立成分了，用现在分词是不会有错的。

谢谢解答