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2020考研英语语法：从属连词
从属连词
从属连词从属连词是用来引导从句的。
1.连词that, if, whether，连接代词what, which, who, whom, whose以及连接副词how, when, why, where可用来引导名词从句，充当主语、表语、宾语等。非正式文体中的宾语从句常省略that：
I think (that) he’ll be back in an hour. 我认为他一小时后就会回来。
Who they are doesn’t matter much. 他们是谁没什么大关系。
Can you tell me where he is? 你能告诉我他在哪儿吗?
He asked me if/whether I knew John. 他问我是否认识约翰。
此外，that, which, who, whom, whose, when, why, where等还可以引导定语从句。
2.连词when, while, before, after, till/until, since, as soon as等引导时间状语从句：
She said hello to me when she saw me. 她看到我的时候，和我打了招呼。
I’ll wait here until you come back. 我将在这里等你回来。
3.连词if, unless引导条件状语从句because, as, since引导原因状语从句：
I’ll help her if she asks me to. 如果她要求我，我就帮助她。
I won’t help her unless she asks me to. 除非她要求我，否则我不会帮她。
He didn’t come because he was ill. 因为他病了，所以没来。
As he hasn’t appeared yet, we shall start without him. 既然他还没有出现，我们就先开始吧。
Since everybody is here, let’s begin. 既然大家都到了，咱们就开始吧。
4.连词in order than, so that引导目的状语从句so…that…引导结果状语从句：
I locked the door in order that we might continue our discussions undisturbed. (=I locked the door in order to continue our discussions undisturbed.) 我把门锁上了，以便我们可以继续讨论而不受打扰。
The car ran so fast that I couldn’t see who was in it. 汽车跑得那么快，我...