英语名词性从句整理学案名词性从句主语从句、表语从句、宾语从句和同位语从句在复合句中的作用相当于名词,因此这种从句叫名词性从句
(一)主语从句主语从句是在复合句中充当主语的从句
that引导的主语从句that引导主语从句时,that不做成分,也没有意义,但不能省略
that引导的主语从句可用形式主语it代替,而把that从句置于句尾
Thatlighttravelsinstraightlinesisknowntoall
众所周知,光沿直线传播
可转换为:It’sknowntoallthatlighttravelsinstraightlines
it用作形式主语,代替主语从句的句型
①it+be+形容词+主语从句(这类形容词有probable,evident,likely,possible,important,necessary)Itiscertainthatfreemedicalcarewillbegiventomostpeopleinourcity
(译)②it+be+名词词组+主语从句(这类名词有ashame,apity,anhonour等)Itisapitythatyoumissedtheexcitingfootballmatch
③it+be+过去分词+主语从句(announced,believed,reported,said,expected等)ItissaidthatLiHaohasbeentoEurope
④It+不及物动词+主语从句,这类不及物动词有(seem,happen,appear)Itseemedthathedidn’ttellthetruth
whether引导的主语从句whether意为“是否”,在从句中不担当句子成分
Whetherlifeexitsonotherplanetsisnotclear
其他星球上是否存在生命不清楚