什么是表语从句?
表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当。表语是说明主语的身份、性质、品性、特征和状态的词或从句,表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当,它常位于系动词(be,become,appear, seem,look,sound,feel,get,smell等词)之后。例句:I am fine. ( fine 是形容词,作表语)He is a boy. ( boy 是名词,作表语)Five plus two is seven. ( seven 是数词,作表语)We are here. ( here 是副词,作表语)He is not at home. (at home 是介词短语,作表语)My hobby is reading. ( reading 是动名词,作表语)Our duty is to make our environment better.(to make 是不定式,作表语)表语从句表语从句的引导词和主语从句的引导词有区别。主语从句的引导词包括if,但if并不引导表语从句,只有一个特例是与as连用,用as if 引导表语从句;另外,表语从句的引导词也包括as,as though,because等。此外,that在表语从句中间不可以省略。而在主语从句中,有时是可以省略的。What the police want to know is when you entered 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.我们的困难是缺乏资金。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。
什么是表语从句?
在句子中用作表语的从句叫做表语从句(predicative clause), 引导表语从句的关联词有疑问代词、疑问副词、缩合连接代词、从属连词等。如:The problem is who we can get to replace her. (问题是我们能找到谁去替换她。)关联词是疑问代词who, 表语从句是who we can get to replace her。The pencil is where it was. ( 那支铅笔就在原来的地方。)关联词是疑问副词where,表语从句是where it was。The trouble is that we are short of money. (麻烦是我们缺钱。)关联词是从属连词 that, 表语从句是that we are short of money 。注:引导表语从句的关联词一般不可以省去。