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表语从句表语从句一、定义：1.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。
Eg:The problem is puzzling. 这问题令人困惑主语连系动词形容词作表语The problem is when we can get a pay rise. 问题是什么时候我们可以得到加薪.主语连系动词一个句子作表语---表语从句2.连接表语从句的连接词有：that, what, who, when, where, which, why, whether,how.He has become a teacher. 他已经成为一名教师。
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 there for an hour. 她曾在那里停留了一个小时。
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 good. 他的建议是好的。
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。
who will travel with me to Beijing tomorrow. 谁与我明天将前往北京。
why he cried yesterday. 昨天他为什么哭。
how I can persuade her to join us in the party. 我怎么能说服她加入我们的派对。
whether the enemy is marching towards us. 是否敌人正向我们行进.二注意：1.表语从句一定要用陈述语序。
表语从句讲解及练习第一篇：表语从句讲解及练习The Predicative Clause表语从句在复合句中作表语的从句称作表语从句，位于连系动词（be，seem，remain等）之后。
1.that 引导的表语从句连接词that 仅起连接作用，无意义，在句中不作任何成分，通常不可省略。
这种从句往往是对主句主语的内容起进一步解释的作用。
The chance is that one smoker in four will die from smoking.2.whether 引导的表语从句连接词whether起连接作用，意为“是否、究竟、到底”，（注意：if不能引导表语从句)在句中也不作任何成分。
The question is whether what man will turn up in time.3.what, which, who, whom, whose引导的表语从句连接代词what, which, who, whom, whose除在句子中起连接作用外，还可在从句中从当主语、表语、定语。
Tom is no longer what he used to be.The question is which of us should come first.The problem is who is really fit for the hard job.The important thing is whose name should be put on the top of the list.4.where, when, why, how引导的表语从句连接副词where, when, why, how除在句中起连接作用外，在从句中还充当时间、地点、方式、原因状语，本身具有词义。
That’s where I can’t agree with you.This is why Sara was late for the meeting.This is how they overcome the difficulties.My strongest memory is when I attended an American wedding.5.其他连词as if, because, as, as though 引导的表语从句because引导表语从句通常只用于This/That/It is because…结构中。
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，与连系动词一起构成谓语。
The problem is puzzling. 这个问题令人困惑。
（主语+连系动词+形容词作表语）The problem is when we can get a pay rise.问题是什么时候我们可以得到加薪。
（主语+连系动词+句子作表语（表语从句））※连接表语从句的连接词有：that, what, who, when, where, which, why, whether, how, whoever，whomever，whichever ，whatever等。
还有如because, as if, as though等。
His suggestion is good.His suggestion is that we should stay calm.The question is confusing.The question is when he can arrive at the hotel.※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.※引导名词性从句时if/whether（是否）用法辨析：if不能引导表语从句，只能用whether 来引导。
引导宾语从句时if/whether可以互换，但介词后面的宾语从句只能用whether来引导。
位于句首的主语从句只能用whether来引导，同位语从句也只能用whether来引导。
False: The question is if the enemy is marching towards us.Right: The question is whether the enemy is marching towards us.※不像宾语从句，在有表语从句的复合句中，主句时态与从句时态可以不一致。
表语从句1．定义：用作表语的从句叫做表语从句。
2．关联词(1)从属连词that。
在从句中不做成分。
如：The trouble is that I have lost his address. 麻烦是我把他的地址丢了。
The reason was that he was late for school.(2)从属连词whether, as, as if。
如：1. He looked just as he had looked ten years before. 他看起来还与十年前一样。
2. 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。
The key is whether we can solve the problem.。
It looked as if it was going to rain.注：能跟表语从句的谓语动词一般为系动词be, seem, look，sound等。
如：He looked just as he had looked ten years before. 他看起来还与十年前一样。
造句：听起来好像有人在敲门。
It sounds as if someone is knocking at the door.(3)连接代词who, whom, whose, what, which, whoever, whatever, whichever 在表语从句中做主语、宾语等。
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。
