2024届高考英语名词性从句讲解讲义

名词性从句 名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句分为主语从句、表语从句、宾语从句和同位从句。 （一）引导名词性从句的连接词 类 别 词 义 在从句中的作用 that 无任何词义 仅起连接作用，在从句中不充当任何句子成分； 一般可以省略，但是在句首不可省略。 if和whether 意为“是否”，表明从句意义的不确定性 起连接作用，在从句中不充当任何句子成分 关系代词： who,what,which,whom, whose,whatever,whoever, whomever, whichever 有各自自身的意义 起连接作用， 并在从句中充当主、表、宾、定语等 关系副词： when,where,why,how,however,whenever, wherever 有各自自身的意义 起连接作用，并在从句中充当状语 （二）主语从句 1.主语从句在复合句作主语。 e.g. Who will go is not important. 2.that引导主语从句时，不能省略。 e.g. That he suddenly fell ill last week made us surprised. 3.用it作形式主语，主语从句放在句末。 It+系动词+形容词+that从句. necessary,right,likely,wrong,important,certain,clear... It+系动词+名词+that从句. a pity, a shame, a fact,no wonder... It+be +动词ed+that从句. said,told,reported,suggested,considered.... It+特殊动词+that从句. seem,turn out,appear,matter... e.g. It doesn’t matter so much whether you will come or not. 4.whether引导的主语从句可放句首，而if引导的主语从句不能放句首，只能放句末。 Whether the worked can be completed on time is doubtful. It is doubtful whether/if the work can be completed. （三）表语从句 1、表语从句在复合句中作表语，位于系动词之后。 e.g. The question was who could go there. 2、引导表语从句的连接词that有时可省去。 e.g. My idea is (that) we can get more comrades to help in the work. 3.一般不用if引导表语从句，用whether. The question is whether we can reduce the cost of the product. 4. 其他连接词：as if ,as though,because,as,like. It sounds as if/though he has been really ill. 5. 主语为reason：表语从句中的连接词要用that，不用why. The reason why he was unhappy is that he has lost his keys. 6. 表语从句中的虚拟语气. （四）宾语从句 1、宾语从句在复合句中作宾语。引导宾语从句的连词that一般可省略。 e.g. I hope (that) everything is all right. 2、介词之后的宾语从句，不可用which或if连接，要分别用what或 whether。 e.g. I’m interested in whether you’ve finished the work.. I’m interested in what you’ve said. 3、whether与if都可以引导宾语从句，常可互换。但下面情况不能互换。 ①宾语从句是否定句时，只用if，不用whether。 e.g. I wonder if it doesn’t rain. ②用if 会引起误解，就要用whether。 e.g. Please let me