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一、什么是“表语”？
说到表语从句，我们首先要说什么是“表语”。
谓语是区别英语和汉语的独特词类，是起表达作用的句子成分；
从形式上讲，它是系词之后的一个成分；
在意义上，它是用来描述主语“是什么或怎样”的成分。
谓语用来说明主语的身份、性质、性格、特征和状态。谓语和系动词作为句子的复合谓语必须形成系动词结构。谓语通常由名词、形容词、介词短语、不定式、形容词现在分词或过去分词和从句来充当。
二、什么是“表语从句”？
当一个句子的表语被一个从句所代替时，这个从句叫做表语从句。
表语从句一般位于系动词之后。
第三，表语从句的连词
常用来引导表语从句的连词主要有：
that
whether
what/who/whom/whose/which
When/Where/Why/How and Its Phrases
(1) That
当that引导表语从句时，它只起连接作用，不充当表语从句中的任何句子成分。比如：
His advice is that we should leave for Shanghai before dawn.
Her plan is that she will call the police first and then try to stop the thief from running away.
[注意]
当名词主语表示建议、命令、要求等时。(如建议、命令、想法、观念、提议、建议、请求等。),
其表语从句中的谓语动词通常采用“should do”的形式，should可以省略。比如：
The officer's order was that all the soldiers (should) never surrender to the enemy.
(2) Whether or not
表语从句表示“是否”的意思时，连词要用“当”。比如：
His question is whether they can arrive in London on time.
需要注意的是，if虽然也可以表示“是否”，但只能用在表语从句中，不能用if。
(3) What/who/who/whose/which?
这些疑问代词如果用来连接表语从句，不仅起连接作用，而且在从句中充当句子成分，可以作主语、宾语、定语等。比如：
My concern is what he really expects to get from us.
Her question is who has broken the glass.
Our dilemma is which side we should take.
Their worry is whom she can rely on.
His puzzle is whose money it belongs to.
(D) When/Where/Why/How and its phrases
这些疑问副词如果用来连接表语从句，不仅起连接作用，还可以在从句中充当句子成分，一般用作状语。比如：
The question is when he will show up at the party tomorrow.
He remains where I was last night.
That's why he was late for school this morning.
Her concern is how he managed to climb into her kitchen yesterday.
[注意]
当主语是reason时，表语从句应该与reason相连，而不是因为。比如：
The reason why he was late was that he missed the first morning bus.
第四，表语从句的特殊连词
除了以上常见的连词，还有一些特殊的连词可以用来连接表语从句。
(a) (only) as
它的意思是“就像”,通常与具象动词look/seem/apparent连用。比如：
She looks just as she was ten years ago.
(2 it seems/seems.
它的意思是“好像”,通常与具象动词look/seem/apparent连用。比如：
It looks as if/though it's going to rain soon.
[注意]
在这种情况下，if/though之后的表语从句中的谓语动词一般采用虚拟语气的形式，其用法是谓语动词的时态要采用相应的过去式。比如：
She acts as if/though she were the hostess of this house.
They looked as if/though they had lived here for a long time.
(3) Because
如前所述，why可以用来连接表语从句。事实上，因为也可以用来连接表语从句。比如：
She is very familiar with the film. This is because she has already seen the film.
[注意]
在这种情况下，虽然既然/for/as可以表达原因，但这三个词不能用来连接表语从句。
五、小测试
好了，我们来做下面六道真题，看看你能不能答对：
请在文章底部的评论中找到参考答案。
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