主语从句做主语是什么意思,要怎么判断主语从句做主语呢
推荐回答（3个）
从句作主语
就是主语从句作主语。会判断名词性从句即可，如果名词性从句处在句子主语的位置上，就是主语从句作主语。如
what
should
be
done
has
been
done
应该做的事已经做了。
本句中what
should
be
done
是名词性从句，处在主语的位置上，所以是主语，该从句就是主语从句。has
been
done是谓语。
另外主语从句作主语时
，为了避免头重脚轻，可以放在后面作真主语，前面用it作形式主语。如
It
is
a
pity
that
we
shall
have
to
leave
tomorrow.
我们明天必须离开，真是遗憾。
该句型必须与强调句型区别开。强调句型中去掉it
is。。。that后
句子结构完整。
如it
is
you
that
we
should
thank。这是对宾语的强调句。原句是we
should
thank
you。
另外还必须与修饰表语的定语从句区别开。如it
is
the
book
that
he
gave
me。
what
you
said
is
right.这个what
you
said
就是一个主语从句，有what引导一个句子，作为主语，后面是系表。还有例句：what
you
have
done
makes
people
scared
这里what
。。。也是一个主语从句，基本是放在前面一个整体句子有主谓语有先行词，后面有谓语、就能找出来了。
你是否想问如何区别主句中的主语从句部分？主语从句中如果再出现一个主句和从句的话，那就太复杂了，估计没有人会那样说话。
一个句子如果有一个主语从句的话，一般会有两种情况：
1.
由一个引导词（What、How、who、when等）后面接一个完整的句子出现在主句谓语动词前；
2.
主语前置词（名词或名词性词组）接一个完整的句子（引导词可省略）做主语。
关键是你要学会如何找出主句谓语。
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