状语从句是把从句用作状语的句子。如果把从句当做一个模块，状语从句不过是一个用状语修饰了的句子。
所以理解状语从句的关键是理解什么是状语。英语中有两种修饰成分，定语和状语。定语修饰和限定名词，状语修饰和限定谓语动词。
所以，理解状语的关键是理解什么是修饰和限定谓语动词。
其实，修饰和限定很好理解，修饰即限定。例如：I have my breakfast at 7 o' clock. 我7点吃饭。7点修饰了吃饭的时间，也限定了吃饭的动作发生在7点，而不是其它时间。
状语可以从以下方面修饰谓语动词：
- Let's do it now.
- 我们现在就开始吧。now作时间状语
- What are you doing here?
- 你在这里干什么？here作地点状语
- If you are tired, you can have a rest.
- 如果你累了，你可以歇会儿。if you are tired作条件状语
- I come here to see you.
- 我来这里看望你。不定式to see you作目的状语。
- Even if you are my father, you have no right to decide what I should do.
- 即使你是我爸爸，你也无权决定我该做什么。even if引导的从句作让步状语
- I do it because of you.
- 因为你，我做了这些。because of you作原因状语
- I like you very much.
- 我很喜欢你。very much作程度状语
- You studied hard, so that you made great achievements.
- 你学习努力，所以你取得了巨大成就。so that引导的从句作结果状语
- Can you speak it clearly?
- 你能说得更清楚些吗？clearly作方式状语
- The president entered the room, followed by many assistants.
- 在很多助理的跟随下，总裁进入了屋子。followed by many assistants作伴随状语
根据以上例句，我们还可以归结出能成为状语的四类句子成分：副词，介词短语，非谓语动词和从句。
- 副词：Can you speak it again and more slowly?
- 介词短语：I can't live without you.
- 非谓语动词：Considering your bad temper, I should speak with you carefully.
- 从句：If you want to go, just go.
如果想看状语从句的分类详解，可以点击下面的站内链接：
，还有时间，地点，方式，让步，条件，结果，比较等，请自行上翻查找。
