一、何谓表语从句
表语从句就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。引导词引导一个句子作表语，放于系动词之后。结构为主语+系动词+引导词+从句。
二、引导词
表语从句常见引导词有：that，whether，what，which，why，when，where，how。举例如下：
例子1that
The trouble is (that) she has lost his money.
麻烦的事是他丢了钱。
例子2whether
The question is whether the film is worth seeing.
问题是这部电影是否值得看。
例子3what
Thats what he is worrying about.
那就是他在担心的事。
例子4which
The question is which of us should go.
问题是我们哪一个应该去。
例子5why
Thats why I object to the plan.
这就是我反对这个计划的原因。
例子6when
That was when I was fifteen.
这是我15岁时发生的事。
例子7where
Thats where I first met her.
那就是我第一次遇见她的地方
例子8how
The problem is how we can find him.
问题是我们如何找到他。
三、使用表语从句注意事项
1.表语从句一定要用陈述语序
例如：The question is when he can arrive at the hotel.()
The question is when can he arrive at the hotel.()
2. 同位语从句只能用whether来引导，if不能引导表语从句
例如：The question is whether the enemy is marching towards us.()
The question is if the enemy is marching towards us.()
3. 不像宾语从句，表语从句中，主句时态和从句时态可以不一致
例如：The question is who will travel with me to Beijing tomorrow.()
The question is why he cried yesterday.()
4. that在表语从句中不可以省略
表语从句只能置于主句之后，而主句的动词只能是联系动词。
例如：
1. The problem is how we can get the things we need.
问题是我们怎样能弄到我们需要的东西。(how 在表语从句中充当方式状语)
2. The scissors are not what I need.
这把剪刀不是我所需要的。(what 在表语从句中充当宾语)
四、应用
在考研英语写作中，我们可以将简单句升级为表语从句，提高所写句式的技术含量。例如：
1. 鱼我所欲也，熊掌亦我所欲也。
I want to eat fish and I want to eat bears paw as well.
变表语从句：Fish and bears paw as well is what I want to eat.
2. 我想买个大房子。
I want to buy a big house.
变表语从句：To buy a big house is what I desire.
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