that在定语从句中做不做成分？和that在名词性从句和定语从句中的用法

Question

如题所述

Answer 1

that在定语从句充当宾语或主语。that在宾语从句中不做成分可以省略，不可省略.同位语从句中that不可以省略，放在名词后，解释前面的名词.表语从句中that不可省略，放在be动词后.主从中不可省

Answer 2

that在定语从句中一定要做成分，多指物
在名词性从句中一定不充当成分，只起连接的作用，在主语从句，表语从句，同位语从句中不能省略，在宾语从句中有时可省略

Answer 3

可以引导宾语从句
which
后应该有名词
例如:i
don't
know
which
book
i
should
choose.
定语从句which
在先行词的后面,在从句中指代先行词,担当句子成分
the
book
which
i
bought
last
sunday
is
written
by
lao
she.which
指book,
做
i
bought
的宾语,可省略
句子拆分:
the
book
is
written
by
laoshe.
i
bought
the
book
last
sunday.
the
boo
k
which
is
on
the
desk
is
mine.which指book,
在从句中做主语
句子拆分:
the
book
is
mine.
the
book
is
on
the
desk.本回答被提问者采纳