(1) 连接时间状语从句的从属连词有：since, until, after, before, when, while, as soon as, whenever.
I’ll tell you as soon as I know.
(2) 连接地点状语从句的从属连词有: where, wherever
I found my books where I had left them.
(3) 连接让步状语从句的从属连词有：although, though, even if, however.
Although she was tired, she kept on working.
(4) 连接原因状语从句的从属连词有：as, because, since, now that,
He was absent because he was ill.
(5) 连接目的状语从句的从属连词有：that, so that, in order that.
He raised his voice so that we could hear him.
(6) 连接条件状语从句的从属连词有：if, unless, once, in case.
You’ll miss the train unless you hurry up.
(7) 连接结果状语从句的从属连词有：so…that, such…that.
He came so late that he missed the class.
(8) 连接比较状语从句的从属连词有：as…as…, not so…as…, less(more)…than, the …the…
This is more than I can accept.
(9) 连接方式状语从句的从属连词有：as, as if
It looks as if it was going to rain.
