用名词性从句,什么叫做名词性从句?

名词性从句类型 主语从句宾语从句表语从句同位语从句 名词性从句结构 以连接词that引导的从句

主语从句

It is certain that she will do well in her exam.

宾语从句

Do you know that he has joined the army?

表语从句

My decision is that all of us are to start at 6:00 tomorrow morning.

同位语从句

只有抽象名词才可以引导同位语,news,fact,suggestion之类的.

例句
There is a feeling in me that we'll never know what a UFO is.
主句和从句都是不缺成分的,但是feeling是一个抽象名词,从句和feeling是同位语.

以连接词whether/if引导的从句 表语从句和同位语从句只能用whether引导,不能用if,宾语从句都可以.主语从句在句首时只能用whether.it做形式主语,主语从句在句尾可以用whether/if引导 以连接代词引导的从句 连接代词

what
which
who
whom
whose
whatever
whichever
whoever
whomever

以连接副词引导的从句

多数在从句中做状语

连接副词

how
when
where