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I usually go to school by bike every day.
He speaks English very well.
You are very beautiful.
用来修饰动词，形容词，副词以及全句的句子成分，叫做状语。adverbial modifier (adv.)
用作状语的通常是副词，介词短语，不定式和从句等。
概念：用作状语的从句叫做状语从句。引导状语从句的关联词是一些从属连词。
When you cross the road, you must be careful.
当你过马路时要小心。（when是从属连词）
I was late because I missed the bus.
我迟到了，因为我误了公共汽车。（ because是从属连词）.
If she asks me, I’ll tell her. 她如果问我，我就告诉她。（if是从属连词）
You look as if you need a rest.
你像是需要休息似的。（as if是从属连词）.
二、状语从句的种类
1、时间状语从句 when, while, as soon as, since, until, before, after
2、条件状语从句 if 3、结果状语从句 so…that
4、比较状语从句 than 5、原因状语从句 because
6、让步状语从句 although, though 7、地点状语从句 where
8、方式状语（没有从句）by...
时间状语从句
引导时间状语从句的关联词常有：after, before, when, while, whenever, as soon as, as, since, until 等。
例：The ball goes up very high after it hits the ground. 这球着地后蹦得很高。
Wait until you’re called. 你等着叫你吧。
When he came, I was cooking.他来时，我在做饭。
I’ll call you as soon as I come back.我一回来就给你打电话。
Before they came back, we had finished the work.他们回来前，我们已经完成工作了。
We haven’t seen each other since he left.从他离开后我们没见过面。
【考点一】while /when辨析
when/while+doing
例：When/while reading, he fell asleep.