明天星期天
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。
童童564852078
表语从句出现在主系表结构的句子中。系动词常见的有be(am/is/are)感官动词look,sound,taste等引导表语从句的引导词有很多种，包括从属连词：that, whether, if ,as if关系代词：who,whom, whose, what,which等。关系副词：when, why, where,how等。由从属连词引导的表语从句如1. The problem is if we could have a further discussion.2. It seems as if it were going to rain heavily.看起来好像要下倾盆大雨。由关系代词引导的表语从句如：1. The main issue is who can carry out the task immediately.主要问题是谁能马上执行任务。2. That is exactly what l'm talking about.由关系副词引导的表语从句如 That is why I want to stay here.
天天大宝贝儿
1. 由that引导The fact is that he doesn’t really try. 事实是他没有做真正的努力。The trouble is that I have lost his address. 麻烦的是我把他的地址丢了。My suggestion is that we should tell him. 我的建议是我们应该告诉他2. 由whether引导The question is whether the film is worth seeing. 问题是这部电影是否值得看。3. 由连接代词引导You are not who I thought you were. 你已不是我过去所想像的人。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 who (m) we should trust. 问题是我们应当相信谁。What I want to know is which road we should take. 我想知道的是我们应走哪条路。4. 由连接副词引导The problem is how we can find him. 问题是我们如何找到他。That was when I was fifteen. 这是我15岁时发生的事。That’s where I first met her. 那就是我第一次遇见她的地方。That’s why he didn’t come. 这就是他没有来的缘故。That’s why I object to the plan. 这就是我反对这个计划的原因。That’s where you are wrong. 这就是你不对的地方。5. 由关系代词型what引导That’s what I want to stress. 这是我想强调的。That’s what we are here for. 我们来这里就为了这个。Fame and personal gain is what they’re after. 他们追求的是名利。He is no longer what he was. 他已经不是以前的他了。6. 由as if / as though引导It isn’t as if you were going away for ever. 又不是你离开不回来了。Now it was as though she had known Millie for years. 现在好像她认识米莉已有好多年了似的。It is not as though we were poor. 又不是我们家里穷。
yuanxia6636
That beautiful pair of Timberland boots, which I had worn for 10 years, was given to me by my sister-in-law.
这就是从句，一层叠一层。
That beautiful pair of Timberland boots, which I had worn for 10 years, was given to me by my sister-in-law.
以上黑体的分别是主语、动词及宾语。
猫女盈盈
如下：
This is what I want.这就是我想要的。
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。
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。
That’s where you are wrong. 这就是你不对的地方。
The problem is who should be responsible for the task.问题就是谁应该对这个任务负责。
表语从句
表语从句位于主句系动词之后，可分为两类：be + that型从句和be +疑问词型从句。
he fact is that we have no idea to solve this problem.事实就是我们没办法解决这个问题。
The reality is that the party must be cancelled because of the storm.现实就是因为暴风雨这个聚会必须得取消了。
冰比冰水冰1025
导语： 表语从句在一个 复合句中，从句作的是主句的表语成分。下面我为您收集整理了英语表语从句的用法，希望对您有帮助!
A. 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。
例句：The problem is when we can get a pay rise. 问题是，当我们可以得到加薪。
B. 连接表语从句的连接词有：that, what, who, when, where, which, why。例句：
He has become what he wanted to be ten years ago.
他已经成为了他10年前想成为的。
She has remained where I stood yesterday for an hour.
她一直在我昨天站的地方站了一个小时。
His suggestion is that we should stay calm.
他的建议是，我们应该保持冷静。
The question is when he can arrive at the hotel.
问题是，他什么时候可以到达酒店。
A. 表语从句一定要用陈述语序。
False: The question is when can he arrive at the hotel.
Right: The question is when he can arrive at the hotel.
B. 不可以用if，而用whether连接表语从句(as if 例外);
引导宾语从句时可以互换if/whether，位于介词后要用whether;
位于句首时要用whether;
引导表语从句，主语从句，同位语从句时要用whether。
False: The question is if the enemy is marching towards us.
Right: The question is whether the enemy is marching towards us.
Right: It looked as if he had understood this question.
C. 不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。
Right: The question is who will travel with me to Beijing tomorrow.
Right: The question is why he cried yesterday.
D. that在表语从句中不可以省掉。
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。
名词性从句在be等系动词后作表语时被称为表语从句，例如：
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)
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)
What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。(what在主语从句中作直接宾语，that作为表语从句的引导词在该表语从句中不充当句子成分，不能省略)
That is what I want to tell you. 那就是我想要对你讲的。(what在表语从句中充当直接宾语)
That is why she failed to pass the exam. 那就是她考试不及格的原因。(why在表语从句中充当原因状语)
注意：“That is why...”是常用句型，意为“这就是……的原因/因此……”，其中why引导的名词性从句在句中作表语，该句型通常用于针对前面已经说明过的原因进行总结，又如：That is why you see this old woman before you know, Jeanne. 珍妮，这就是现在这个老太婆出现在你面前的原因。(前文提到Jeanne对老妇人显得苍老憔悴深感诧异，说话人对她讲述了其中的原因之后，用这一句来进行概括)。
下面是两个与“That is why...”形式相似的结构，它们与“That is why...”结构之间的关系要能够辨析清楚：
(1)“That is why...”与“That is the reason why...”同义，只不过从语法结构上讲，“That is the reason why...”中why引导的是—个定语从句，将其中的the reason去掉则与“That is why...”结构一样，例如：
That is (the reason) why I cannot agree. 这就是我不能同意的理由。
(2)“That is because...”句型中从属连词because引导的名词性从句在此作表语，这也是个常用句型，意为“这就是为什么……/因为……”。“That is because...”与“That is why...”之间的不同在于“That is because...”指原因或理由，“That is why...”则指由于各种原因所造成的后果， 例如：
He did not see the film last night. That is because he had to help his little sister with her homework. 昨天晚上他没有去看电影，那是因为他得帮助他的妹妹做作业。(第一句话说明结果， 第二句话说明原因)
He had seen the film before. That is why he did not see it last night. 他以前曾看过那部电影，因此他昨天晚上没有去看。(第一句话说明原因，第二句话说明结果)
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