‘状语从句只是句子中谓语的附加成分吗?’
不能说是谓语的附加成分,而应当是语谓语有关的的成分,很多状语修饰谓语动词,表示谓语动词的动作所发生的时间、地点、方式方法、目的、结果、原因等等.下面列举数个供参考：
时间状语从句：
When Susan goes to town,she will visit her grandma.苏珊每次进城,总要去看望她奶奶.
地点状语从句：
I will go where I am needed.哪里需要我,我就到哪里去.
方式状语从句：
I have changed it as you suggested.我已经按照你的建议作了改变.
原因状语从句：
Mary didn’t go shopping because I advised her not to.玛丽没有去购物,因为我劝她不要去.
目的状语从句：
They worked hard in order that they might succeed.他们努力工作,以便能够获得成功.
结果状语从句：
Waste must be treated so that it does not become a danger to life.废物必须进行处理,这样它才不会成为危害生命的东西.
条件状语从句：
If he works hard,he will surely succeed.如果努力工作,他肯定会成功.
让步状语从句：
Though we are all different,we need never be separate.虽然我们都不相同,我们不应当分离.
比较状语从句：
I was happier than I had ever been in my life.这是我一生中最快乐的时光.
