弄懂这些知识（以后学习就不用那么费劲了：三种从句对比记）

一、宾语从句

用作宾语的从句叫宾语从句，宾语从句的语序必须是陈述语序。

1、that引导的宾语从句

He said (that) he wanted to stay at homeI told him that he was wrong.I am satisfied with what he said .

2、if、whether 引导的表示“是否…”的宾语从句

I don"t know if / whether he will come tomorrow. 我不知道是否明天他将来。

3、疑问词引导的宾语从句

Do you know which film they are talking about? 你知道他们正在讨论哪部电影吗？

4、形容词宾语从句

I am glad（that）you can come to the party. 很高兴你能来到party中。

二、定语从句

定语从句一般都紧跟在它所修饰的词后面，所以如果在名词或代词后面出现一个从句，根据它与前面名词或代词的逻辑关系来判断是否是定语从句。被定语从句所修饰的名词或代词叫做“先行词”,引导定语从句的词叫“关系词”。

The boys who are playing football are from Class One. 正在踢足球的这些男孩是来自一班。Yesterday I helped an old man who lost his way. 昨天我帮助了一位迷了路的老人。This is the pen (which) he bought yesterday. 这是他昨天刚买的钢笔.注意：当先行词是人且从句缺宾语时用whom ;当先行词是人且从句缺主语时用who ;先行词为人或物从句不缺主宾时用whose。例：The girl whom you are talking about now is my sister,The girl who is singing a song is my sister.The house whose windows are broken are under repair.

三、状语从句

1、时间状语从句： when, whenever, while, as, before, after,since, till, as soon as,

2、地点状语从句： where, wherever,

3、原因状语从句： because, since, as, for,

4、目的状语从句： in order that, so that,

5、结果状语从句： so…that…, such…that…, so that,

6、条件状语从句： if, unless, as(so)long as,

注意: if 引导的条件状语从句，其结构为：(if +状语从句，＋主句）。要注意在状语从句中有一个规则是“主将从现”，即主句是将来时，则从句要用一般现在时表示将来。

7、让步状语从句： though虽然/尽管, although虽然/尽管, even if即使, even though即使, however, whatever, as,

8、比较状语从句： as…as…, so…as…, than,

9、方式状语从句： as, as if似乎/好像, as though似乎/好像