陕西省兴平市秦岭中学 2014 届高三英语专题复习 名词性从句学案一、名词性从句的概念、功能与结构⑴ 概念与功能名词性从句包括主语从句、宾语从句、表语从句以及同位语从句,因为这四种从句从句在复合句中的作用相当于名词,因此它们被称为名词性从句。⑵ 结构名 词 性 从 句 主 要 有 三 种 结 构 : ① that + clause ②whether/if + clause ③ 连 接 代 词(who 、whom、whose、what、which)/ 连接副词(when、where、how、why)+ clause另外,wh-ever (whoever、whomever、whatever、whichever) 也可引导主语从句和宾语从句;as if / as though、because 也可引导表语从句。具体用法见下表:引导词主语从句宾语从句表语从句同位语从句作动词宾语作介词宾语that一般不省略可以省略一般不省略一般不省略一般不省略whether/if句 首 只 用whether用whether/if,但有区别只用 whether只用 whether只用whether连接代词/连接副词都可用,但要注意用陈述句语序wh-everwh-everwh-ever wh-ever\\as if / as though\\\as if / as though\二、宾语从句三、主语从句⑴ 概念 — 作主语的句子叫主语从句。⑵ 引导词①that 从句作主语时,常用 it 作形式主语,常见以下三种结构:It + be + adj. (obvious、true、natural、etc)+ that-clause / It + be + n.(a pity、no wonder、an honour、etc)+ that-clause / It + be + done (said、expected、announced、etc)+ that-clause。 如:1.It is certain that he will do well in the exam. 2.It is a pity that he cann’t come. 3.It is reported that the plane has crashed.注意 that 在口语和非正式文体中可省略,但当 that 位于句首时,绝对不能省略。如:That he will help us is good news to us.②whether/if 引导主语从句时,句首只能用 whether;但当句子结构为 It + be + adj. / + n.+ 引导词时 ,whether/if 都可代替引导词。如:1.Whether we will have a holiday is still a question. 2.It is still a question whether/if we will have a holiday. 3.It is doubtful whether/if he will come.③ 连接代词或连接副词引导主语从句时,既可放在句首也可用 it 作形式主语将其放在句末。如:1.Which kind of food...