表语从句介绍.docxVIP

XueDaEducationTechnology (Bei 语法表语从句 一、 课堂导入 1. That is why stone walls are used instead of fences around New England fields. 2. That fact is that more than seventy percent of the earth’s surface is covered by water. 3. This is what I want.4. The reason why he was late is that his bike broke down. 5. Next Sunday is when we shall meet. 6. This is why I am late.7. My problem is which computer to choose. 知识点1 ：表语从句的概念 概念： 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。 如：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） 注意：“主语+系动词+表语从句”。 常见的连系动词有：be动词(am, is, are, was, were)、表示持续的系动词（keep, remain, stay）、感官动词feel(摸起来， 感觉) , smell(闻起来) , sound(听起来) , taste(尝起来，吃起来) 等、表示变化的系动词（become, grow, turn, fall, get, go,）、表终止的系动词prove, turn out(结果是，证明是)、seem, appear（看起来...） 表语从句都用陈述句语序： E.g.: The question is when he can arrive at the hotel 这个问题是他什么时候能到达宾馆。 That is what I want to tell you. 那就是我想要对你讲的。 知识点2：表语从句的引导词 引导表语从句的连接词分为三类： 从属连词：that, whether, as if.(从属连词在从句中不但当成分，只起连接作用，that无词义) 连接代词：Who, whoever, whom, whomever, what, whatever, which, whichever, whose. (连接代词在从句中充当主、宾、表、定的成分，起连接作用，有词义) 连接副词：when, where, why, how等。 (连接副词在从句中充当状语的成分，起连接作用，有词义) 1、 由从属连词that，whether，as if/as though引导的表语从句。 that在引导表语从句时无词义，而whether有词义，意为、“是否”，表语从句不能用if引导。这时主句的主语常常是些抽象名词，如question(问题)，trouble(麻烦)，problem(问题)，result(结果)，chance(可能性)，suggestion(建议)，idea(想法)，reason(理由)等。表语从句对主句主语进行说明、解释，使主语的内容具体化。 例如： The trouble is (that) she has lost his money. 麻烦的事是他丢了钱。 The question is whether we need more ice cream.问题是我们是否还需要一些冰淇淋。 as if/though“好像”，引导表语从句时要注意语态。如果句中的情况与事实不相符，从句多用虚拟语气。如果从句表示与现在事实相反,谓语动词用一般过去式；如果从句表示与过去事实相反时,谓语动词要用“had + 过去分词 ”；如果从句表示将来的可能性不大，用would (might ,could )+动词原形. Li Lei is now in a new jacket. He looks as if he were an American boy. (与现在事实相反) The girl is giving us a vivid description of the moon. It seems as if she had been to the moon many times. （与过去事实相反） It looks as if it mi