关于宾语从句连接词that省略的问题

suggest
(that)…I
suggest
(that)
we
go
out
to
eat.
agree
(that)…We
agreed
(that)
the
proposal
was
a
good
one.
be
agreed
(that…)It
was
agreed
(that)
we
should
hold
another
meeting.
--不是宾语从句了,it
是形式主语.
代替了that
引导的从句.
learn
(that)…We
were
very
surprised
to
learn
(that)
she
had
got
married
again.
从字典中的例句可以得知:"
learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时，that不可以省略。"
这句话是错误的。
没听说过这条规则,that
引导宾语从句,在非正式问题,口语中,that
可以省略,
不受谓语动词限制.

当that作learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时;
当宾语从句较长时;
当主语状语置于主句尾,宾语从句之前时;
当主语谓语动词(包括非谓语动词)与宾语从句之间有插入语时;
当一个动词带有两个或两个以上宾语从句时,此时第一个that可以省略,第二个that不可以省略;
当宾语从句中的主语是this,that或this,that做主语的定语时;
当宾语从句是双宾语中的直接宾语时;
当宾语从句的主语是非谓语动词或主语从句时;
当主语中的谓语动词是固定词组时;
当主语从句有it做其先行词时;
在直接引语中,转述分句把宾语从句隔开时.