请问哪些用that引导的从句that可省，或不可省，如介词后面跟that 从句

Question

如题所述

Answer 1

可省that的从句，原则是that 在从句中只起连接作用，不代替任何成分，主要用于部分的宾语从句，定语从句，而在that省略之后也不会造成对句意的误解。
例如：
It's time (that) we left. （定从）我们该走了。
That's the way (that) I study English.（定从）
I'm sure (that) you'll pass the exam. (宾从）
不可省that的从句，
1) 习惯用法，不省略。
2）因为that代替句中的某个词而作某个成分时，在that省略之后，句意不明确。
3）固定搭配，不能省。
例如：
The degree that water freezes is called freezing point, isn't it? （定从）
It is necessary that every one of you practices speaking English every day.(主从)
We have the conclusion that one can't learn anything without his own practice.（同位语从句）
My suggestion is that he should ring her up right away.(表从）
You'd better take the umbrella with you for fear that it should rain. (目的状语从句）
Atoms are so small that we cannot see them at all. (结果状语从句）

Answer 2

1）that引导宾语从句，在句中不做成分，用作连词，通常可略

2） 引导主语从句，在句中不做成分，用作连词，通常不略

3） 引导同位语，表语从句，不做成分，不能略

4） 引导定于从句，必做成分，做主语时不能略，宾语可以略本回答被提问者采纳

Answer 3

介词的宾语从句就是一个句子做介词的宾语，如，i
didn't
listen
to
what
my
mother
said
because
my
brother
was
making
a
noise.这里what
my
mother
said
是
个句子
作listen
to
的宾语，这里to
是介词，所以
what
my
mother
said
是listen
to宾语从句。
介词+关系代词的定语从句
1.关系代词which/whom在定语从句中做介词的宾语时,从句常用"介词+which/whom"引出,有时也用"介词+whose+名词"引出.例:
great
changes
are
taking
place
in
the
city
in
which
they
live.
this
is
the
teather
from
whom
we've
learnt
a
lot.
2.定语从句也可由”名词／代词／数词＋介词＋which/whom”引出.例:
the
house
the
windows
of
which
were
damaged
has
now
been
repaired.