1、宾语从句在复合句中作宾语。引导宾语从句的连词that一般可省略。
I hope (that) everything is all right.
2、引导表语从句的连接词that有时可省去。
My idea is (that) we can get more comrades to help in the work.
注意: 表示是否,只能使用whether.
(四)宾语从句
1、表语从句在复合句中作表语，位于系动词之后。
The question was who could go there.
3、that引导主语从句时放在句首时，不能省略。
That he suddenly fell ill last week made us surprised.
实用例句:
Is it true that he will be punished seriously by the headmaster?
Does it make any difference who bought these gifts?
How strange it is that these children are so quiet!
(三)表语从句
2、用it作形式主语，主语从句放在句末。
It doesn’t matter so much whether you will come or not.
1、主语从句在复合句作主语。
Who will go is not important.
3、连接词：that, whether, if, as if, that
(二)主语从句
2、连接副词：when, where, why, how。有词义，在从句中担任成分，作状语。
1、连接代词：who, whose, whom, what, which。有词义，在从句中担任成分，如主语、表语、宾语、或定语等。
2.所有的从句要使用陈述语序. 陈述语序: 句子第一个词永远是主语;第二个词可能是情态动词\助动词等加上动词,或者是动词本身.
名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句分为主语从句、表语从句、宾语从句和同位从句。
名词性从句,顾名思义,它具有名词性.所以可以作主语,宾语等等.回忆一下句子成分那一章
(一)引导名词性从句的连接词