使用独立主格的意义是什么

首先独立主格是用在两个句子之间没有连词的情况下.
这里先说下,两句子之间没有连词.这时候你有三种选择
1.分词作状语,这里又分为主动和被动的,主动的有doing,having done被动的有done,have been done,being done(不太常用)
给你几个例子
主动doing:Seeing from the moon,I found a blue planet-the Earth.
主动having done:Not having received her letter for a long time,he decided to write to her.
从上面两个例子可以看出doing和having done的区别在于后者强调动作发生有明确的先后顺序
接着是被动的
done:Seen from the moon,the Earth is a beautiful planet.
have been done:Having been taught for many times,he could do it himself.
两者的区别也在于后者强调先后关系.
being done用来强调正在发生一般不出现的.
这里要注意考试中常常出现的陷阱
比如____ the sunrise,he got up early.这要根据句子意思所以是填不定式to do这道就是To see.
2.可以加一个连词,就拿你这句为例子,改成When I was walking in the forest,an old city appeared before our eyes.
3.就是独立主格了,只要在doing前面加一个主语就可以了 所以只要加个We.
上面就是我自己对句子没连词的题目做法,我们老师以前就是这么讲的.