Question

that引导哪些从句可以省略

Answer 1

宾语从句中的that可以省略,定语从句中假如引导词that在从句中充当宾语,可以省略.
例如：宾语从句：I
promise
that
I
will
study
hard.这里的that可以省略
定语从句
This
is
the
factory
that
we
visited
yesterday.这里的that可以省略
但是在这句中：This
is
the
factory
that
lies
in
Guangzhou.这里的that做主语,不能省略.
以下情况不可省略
1.that引导主语从句、表语从句、同位语从句时不能省略
2.宾语从句不止一个时,不能省略
如；they
complain（that）they
have
to
do
homework
from
morning
till
night,that
it
is
hard
to
study
good,that
they
are
very
tired.是连续的宾语从句时,第一个可省,后面都不行.
3.宾语从句与主语之间有插入语时,不可省
如：the
teacher
said,happy
and
firmly(插入语),that
we
must
do
homework.
4.引导宾语从句是一个主从复合句
如：i
belive
that
if
i
work
harder,i
will
pass
the
exam.

Answer 2

由that引导的表语从句如：
the
trouble
is
that
he
misunderstood
me.麻烦的是他误解了我
that是不可以省的
有时,引导表语从句的连词that可以省略
the
truth
is
(that)
i
didn’t
finish
my
term
essay.
事实是我没有写完学期论文。
表语从句中应注意：
1.
连接词that一般不能省略，但当主句中含动词do的某种形式时，that可以省略。如：
what
i
want
to
do
is
(that)
i
can
go
up
to
him
and
thank
him.
我想做的事是走到身边去感谢他。
2.
当句子的主语是：advice,
demand,
decision,
desire,
idea,
insistence,
instruction,
order,
plan,
proposal,
recommendation,
request,
requirement,
suggestion,
wish等名词时，表语从句须用虚拟语气，即：should
+do。如：
my
advice
is
that
you
should
go
to
apologize
to
him.
我的建议是你应该去向他道歉。