that引导主语从句时,常用it作形式主语,而将that从句后置,常构成以下结构:
a.It+be+adj.+that clause
b.It+be+v.ed+that clause=sb./sth. be+v.ed+to do/have done
c.It+be+名词词组+that clause
d.It+seems/happens/appears+that clause
It occurs/occurred to sb.+that clause
当句子主语是reason时,引导表语从句的引导词用that而不用why,即:the reason is that...。
that引导的从句只作介词except/but/in的宾语。
同位语从句大多由that引导,但that只起引导作用,不作句子成分,无实际意义,不可省略。
(2)what引导的名词性从句
what引导名词性从句时,为连接代词,有意义,既起引导词作用,又在从句中作主语、宾语或表语。
(3)whether和if引导的名词性从句
whether和if表“是否”之意,都可以引导宾语从句,但其他从句一般只用whether而不用if引导。
(4)其他引导名词性从句的词还有:连接代词who/whom/whose/which/what/whoever/ whomever/whichever/whatever和连接副词when/where/why/how
(5)与表“建议、命令、要求”(即:insist/order/command/suggest/advise/propose/ demand/ask/request/require)相关内容的名词性从句需使用“(should)+动词原形”的虚拟语气
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