什么是名词性从句

名词性从句： 包括主语从句、表语从句、宾语从句和同位语从句。

引导名词性从句的连词有：who; whom; whose; what; which ;when ;where; why ;how; that; if ;whether; whatever; whenever ; wherever; however 等。

名词性从句注意事项：

从句的语序为陈述句；

连词that不充当任何成分；

what总是要充当主语、表语、宾语等。

If和whether 的区别： if引导宾语从句和条件状语从句； whether引导主语从句、表语从句、宾语从句和同位语从句.

（1） 主语从句： 用作主语的从句，叫主语从句。

主语从句可以直接放在句首；也可用it作形式主语，而将从句放在句末。

常见的用it作形式主语的复合结构：

It is +名词＋that 从句； It is a fact(a pity, a shame, no wonder, good news…)that…

It is+形容词＋that从句；It is necessary(strange, important, wonderful, possible , likely,…)that… 这类句中谓语动词多为（should）+动词原形。

It is +过去分词＋that 从句； It is said (reported, decided, believed,..)that…

It +不及物动词＋that 从句；It seems (happened, doesn’t matter , has turned out,…)that…

What you need is more practice.(what在从句中作need的宾语)

What is hard is to do good all one’s life and never do anythin