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高考语法复习:名词性从句讲解及提升练习考点一:主语从句1.主语从句的引导词连接词that,whether,if只起连接作用,不在从句中作成分连接代词what,who,whom,which,whichever,whatever,whoever在从句中作主语、宾语、表语或定语连接副词when,where,how,why在从句中作状语Yoursupportisimportanttoourwork.Whateveryoucandohelps.你的支持对我们的工作很重要。你能做的任何事情都会对我们有所帮助。WhereLiBai,agreatChinesepoet,wasbornisknowntothepublic,butsomewon'tacceptit.李白,中国伟大的诗人,出生的地方人人皆知,但是有些人对此并不接受。ThatyouarecomingtoLondonisthebestnewsIhaveheardthislongtime.长久以来我听到的最好的消息就是你要来伦敦。[易错提醒] (1)that引导主语从句时一般不省略。(2)当主语从句位于句首时,常用whether引导,而不用if。2.形式主语it作形式主语的常见句型:(1)It+be+形容词(necessary/likely/important/certain等)+that从句(2)It+be+名词(短语)(apity/ashame/nowonder等)+that从句(3)It+be+过去分词(said/told/reported等)+that从句(4)It+不及物动词(seem,appear,happen,matter等)+that从句Itisuncertainwhatsideeffectthemedicinewillbringabout,althoughabouttwothousandpatientsha