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表语从句虚拟语气的用法归纳
表语从句用法归纳：
1、表语从句概说
表语从句即在主从复合句中用作表语的从句。引导表语从句的词有连词that，whether，连接代词和连接副词以及as if，as though，because等连词。
（1）My idea is that we should do it at once。我的想法是我们应该马上做。
（2）The question is whether he is honest。问题是他是否诚实。
（3）The problem is how we can find him。问题是我们如何找到他。
（4）That was when I was fifteen这是。我15岁时发生的事。
（5）That's why I can't go with you。那就是我不能同你一起去的原因。
（6）It isn't as if you were going away for ever。又不是你离开不回来了。
（7）It is because I love you too much。那是因为我太爱你了。
2、两点重要说明：
(1) whether可引导表语从句，但与之同义的if却通常不用于引导表语从句；because可引导表语从句，但与之同义的since，as，for等也不用于引导表语从句。
(2) 引导表语从句的that通常不省略，但在口语或非正式文体中有时也可省略：The trouble is （that）he is ill。糟糕的是他病了。
顺便说一句，引导主语从句that通常也不能省略，但若句首使用了形式主语it，真正的的主语从句位于句末时，that有时也可省略。
表语从句的例句和结构
This is what I want,这就是我想要的 The reason why he was late is that his bike broke down. 他迟到是因为自行车坏了 Next sunday is when we shall meet. 下周日是我们见面的时间 This is why I am late.这就是我迟到的原因 My problem is which computer to choose 我的问题是不知道选哪个电脑好 The argument is whether it rains tomorrow 明天是否下雨是争论的内容
What the police want to know is when you entered red the room警察想知道的是你什么时候进的房间。
The trouble is that we are short of funds困难是我们缺乏资金。
This is what we should do这是我们应当做的。
That‘s why I want you to work there那就是我要你在那儿工作的原因。
His first question was whether Mr. Smith had arrived yet他的第一个问题是史密斯先生到了没有。
注意：从句中的疑问句用正常语序，即陈述语序。
as if,as though,because也可用来引导表语从句。
She seems as if she had done a great thing她看起来好像做了一件大事。
It is because you eat too much是因为你吃得太多了。
什么是表语从句
表句从句就是"表句是个句子",同理,宾语从句,定语从句都这样理解.
表语从句放在连系动词之后,充当复合句中的表语/
下面是我找到的材料,参考一下吧.
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基本概念
1． 定义：用作表语的从句叫做表语从句。
2． 构成：关联词+简单句
3． 引导表语从句的关联词的种类：
(1) 从属连词that。如：
The trouble is that I have lost his address. 麻烦是我把他的地址丢了。
(2) 从属连词whether, as, as if。如：
He looked just as he had looked ten years before. 他看起来还与十年前一样。
The question is whether they will be able to help us. 问题是他们是否能帮我们。
注：从属连词if一般不用来引导表语从句，但as if却可引导表语从句，如：
All this was over twenty years ago, but it´s as if it was only yesterday.
这都是20多年前的事了，但宛如昨天一样。
能跟表语从句的谓语动词一般为系动词be, seem, look等。如：
It looked as if it was going to rain. 看起来天要下雨了。
(3)连接代词who, whom, whose, what, which, whoever, whatever, whichever
连接副词 where, when, how, why。
如：The problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。
The question is how he did it. 问题是他是如何做此事的。
That was what she did this morning on reaching the attic. 那就是她今晨上了阁楼干的。
that做主语从句的连接词
that可以引导以下从句：
1、用作关系代词，引导定语从句 The only thing that I can do is to have a rest . 我唯一能做的事就是休息。
2、用作关联词，引导名词性从句
That the earth turns around the sun is known to all. 地球围着太阳转这一点是众所周知的。（引导主语从句）
It so happens that I know the man. 碰巧我认识那人。（主语从句）
I will see to it that everything is ready. 我会注意把一切准备妥当的。(宾语从句)
The trouble is that we are short of money.困难就在于我们缺钱。（表语从句）
There is no doubt that he is the best choice for this position. 无疑，他是这一职位的最佳人选。（同位语从句）
3、构成短语，引导状语从句
Bring it nearer so that I may see it better .拿近一点，好让我看清楚些。 ( so that 引导目的状语从句)
She got up early , so that she caught the early bus. 她起得早，所以赶上了早班车。( so that 引导结果状语从句)
In order that everybody should hear him , he spoke loudly. 他大声说话，为了使大家都能听得见。（in order that引导目的状语从句）
Now that they have taken matters into their hands the pace of events has quickened.他们既然已着手自己来处理问题，事态的进展也就加快了。（now that 引导原因状语从句）
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