从句是英语中很重要的一个大点，前几篇文章我们讲了定语从句和一些英语的基础知识，今天就来和小编一起学习一下名词性从句叭。
首先我们来了解一下名词性从句都包括什么。
分类：宾语从句、表语从句、主语从句、同位语从句
宾语从句
连接词：
-从属连词： that, if, whether
-连接代词： what(ever), who(ever), which(ever), whom,whose
-连接副词： when, where, why, how
注：① that 引导的宾语从句无意义不做成分所以可以省略，但是如果有2 个及以上的宾语从句，第二个及之后的that不可省略
I believe you"ve done your best and that things will be better.
②若 that 作介词的宾语， that 不可省略
in that 因为 but that 要不是
They share little in common except that they are from some country.
③ if/ whether
1) whether……or not; whether to do sth.是否要去做某事
2）介词+ whether
Everything depends on whetherwe have enough money.
3) diss whether
We are disscussing whether we should close the shop right now.
4) if 引导宾语从句 whether 引导名词性从句
④ doubt+宾语从句
-肯定句：if/ whether
-否定句：that
⑤1234（1坚持2命令3建议4要求）+宾语从句（should）+v.
insist, order, command, advise, sugges t, propose, require, request, desire, demand
⑥宾语从句的时态与语态
⑦ I think, believe, expect, imagine 否定前置
表语从句
系动词：
- be
-感官动词： sound, look, taste, smell, feel
- keep, stay, remain, get, become, turn, seem, appear
连接词：because, as if/though
注：
①表语从句中that无意义不做成分但不可省略
②whether
③as if/though在seem, look, appear之后
④三个句型
That"s why+结果 那是...的原因
That"s+because+原因 那是因为
The reason why+句子 ...is that...
主语从句
注：①that 引导的主语从句无意义不做成分不可省略
②whether . it 作形式主语可用if
Whether we will go there tomorrow depend on the weather.
It"s doubtful if/whether this painting is Picasso.
③It作形式主语
It is obvious/clear/important that+主语从句It is no wonder that+主语从句 难怪...It is a pity that...It is reported/believed/suggested +主语从句It seems/happens that +主语从句④ what 引导的主语从句 ...的东西、事情、话
同位语从句
同位语：通常跟在某些名词之后，用于解释该名词所表示的具体内容
注：①与定语从句的区别
-连接词的作用不同
-从句的作用不同
②news,idea, fact, problem, possibility, truth, hope, information, belief, doubt, promise 后接同位语从句
③分隔式同位语从句
好啦，今天的名词性从句就先讲到这里啦，大家还有什么问题可以评论区留言哦~觉得小编写的还不错请记着给小编一个赞呦。
