时间状语从句：when, while, as ,before, after, since, until, as soon as
地点状语从句：where
原因状语从句：because, as, for, since, in that
目的状语从句：so that, in order that
结果状语从句：so ... that, so that, such ... that
条件状语从句：if, unless, as/so long as, once
让步状语从句：although, though, even though/if, while
比较状语从句：as, than
方式状语从句：as, as it
时间地点状语从句
原因状语从句：当：随着
结果状语从句：以致于、结果.
目的状语从句：为的是，以便于
so +形容词+ that
such +名词+that
让步状语从句：虽然；但是；然而
非谓语
在句中不作谓语成分的动词就叫做非谓语动词
（动词／非谓语）
分类
To do不定式
doing 动名词/现在分词。通常前面不能有be 动词
done过去分词。通常前面不能有be动词以及have, has, had
