如何判断句子中的连接词that是否可省略呢？
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。
连接表语从句的连接词有：that, what, who, when, where, which, why, whether, how, whoever，whichever ，whatever等。还有如because, as if, as though等。
1、His suggestion is that we should stay calm.
他的建议是，我们应该保持冷静。
2、The question is when he can arrive at the hotel.
问题是，他什么时候可以到达酒店。
扩展资料：
一、表语成分：
表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的-ing、从句来充当。
它常位于系动词（be, become, appear, seem,look,sound,feel,get,smell等词）之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。
二、表语从句例句：
1、This is what I want.
这就是我想要的。
2、The reason why he was late is that his bike broke down.
他迟到是因为自行车坏了。
3、Next sunday is when we shall meet.
下周日是我们见面的时间。
4、This is why I am late.
这就是我迟到的原因。
5、My problem is which computer to choose.
我的问题是不知道选哪个电脑好。
参考资料：
百度百科-表语从句
从句中连词是that的情况，分为定语从句和名词性从句。
定语从句用that做关系代词（即连词），可以省略的情况：that在从句中担任宾语，可以省略。
名词性从句包括：主语从句、表语从句、宾语从句、同位语从句。
that在主语从句、表语从句、同位语从句中做连词，都是不可以省略的。
在宾语从句中做连词，一般可以省略，但是有些特殊的条件下不可以省略：
1. and连接两个宾语从句，that宾语从句放在and的后面时。
2. that引导的宾语从句作介词宾语时。
3. that从句位于句首时。
4. 主句谓语动词与that从句之间有插入语。
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