从属连词的用法

1） 从属连词可以引导状语从句。 （详见状语从句一章）

引导时间状语从句的连词: when , while, as, before, after, until, till, whenever
引导条件状语从句的连词: if, unless supposing, providing, provided, suppose
引导目的状语从句的连词: in order that, so that, so, that, lest
引导结果状语从句的连词: so…that, such…that, so that, so
引导原因状语从句的连词: because, as, since
引导让步状语从句的连词: although, though, even though, even if, while
引导方式状语从句的连词: as, like, the way, as if, as though
引导地点状语从句的连词: where, wherever
引导比较状语从句的连词: than, as2） 从属连词连词可以引导名词性从句（包括主语从句，宾语从句和同位语从句）。（详见相关章节）

a) 从属连词连词引导主语从句
* That you will win the medal seems unlikely. 你想获得奖牌看起来是不可能的。
* What you need is more practice. 你需要的是更多的练习。
* Why he did it will remain a puzzle for ever. 为什么他做那件事将永远是个谜团。
* Whether he will join us won't make too much difference. 他是否加入我们，没有太大的差别。

b) 从属连词连词引导宾语从句
* I hope that he will be fine soon．我希望他很快好起来。
* Do you know who will come this afternoon？你知道今天下午谁来吗？
* We didn't know when she would come back．我们不知道她什么时候回来。
* Nobody knows whether (if) it will rain tomorrow. 没有人知道明天是否下雨。

c) 从属连词连词引导同位语从句
* There is no doubt that he will keep his promise. 我们相信他会守信。
* There is no evidence that he committed crime. 没有他犯罪的证据。
* He had no idea why she left. 他不知道她为什么离开。

3） 从属连词可以引导表语从句（详见表语从句一章）
* The truth is that he was very shy. 事实是他很害羞。
* The problem was who could do the work. 问题是谁能做这项工作。
* The question is whether the film is worth seeing. 问题是这部电影是否值得看。
* That's because we never thought of it. 这是因为我们从未想过此事。
* It looked as if it was going to snow. 看起来好像要下雪了。