表语从句

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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

连接表语从句的连接词有：连词：that, whether

连接代词：what,who,which,whoever,whomever,whichever,whatever等 关系副词：when,where,why, 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。 注: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. 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.

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. that在表语从句中不可以省掉。 基本用法

表语从句只能置于主句之后，而主句的动词只能是连系动词。 名词性从句在be等系动词后作表语时被称为表语从句

例： 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)

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