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1、专业.专注高考英语主语从句定义：用作主语的从句叫主语从句，它是名词性从句之一。主语从句的时态：不受主句的时态影响和限制。引导主语从句的连接词有：从属连词:that,whether；连接代词:who(whoever),whom,whose,what(whatever)和which(whichever)；连接副词:when,where,how和why。连接词：1.从属连词：that，whether1）that引导主语从句只起引导作用，在主语从句中不充当任何成分，that本身无实际意义，但不能省略。2）whether意为“是否”，放在句首句末皆可。由whether引导的名词从句做主语，表语，介
2、词宾语，同位语时！不可用if代替。a.Thatpricewillgoupiscertain.b.Whethertheywouldsupportuswasaproblem.他们是否会支持我们还是一个问题。2.连接代词who，what，which,whatever,whichever,whoever(Who,whom,which,what可以和ever构成合成词，和what一样引导从句，ever起到强调作用。此类主语从句不能用形式主语it引导，它们在句子中担任成分，不能省略，语序为陈述语序，既有疑问含义,又起连接作用,同时在从句中充当各种成分。Whichsidewillwinisnotcle
3、ar.Whoeverbreaksthelawwillbepunished.Whateverhedidisright.Whokilledthescientistremainsaquestion.1）What和that引导的主语从句的区别：that只起引导作用，不充当任何成分，没有意思。What不仅起引导作用，还要充当一定成分(主语、宾语或表语)，意思是：“什么”。Whatweneedismoney.Thathewillcomeiscertain.学习参考专业.专注2）whatever/whoever的用法（~ever=nomatter~---让步状语从句中） whatever/who
4、ever可以引导主语从句,并在句中作主语、宾语、表语等,不含疑问意义。whatever相当于anythingthat;whoever相当于anyonewho。例如:Whoever(Anyonewho)wantstoenterintothisschoolmusttaketheexam.Whatever(Anythingthat)shedidwasright.3.连接副词when，where，how，why等。既有疑问含义,又起连接作用,同时在从句中充当各种成分。How this happened is not clear to anyone. Whenhewillbebackdepends
5、ontheweather.Whenwe’llstarttomorrowwillbetoldsoon.Wherethetestwillbegivenisnotyetdecided.4.主语从句后置：为了避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.例:Thatweshallbelateiscertain.--It’scertainthatweshallbelate.1）用it作形式主语的结构A. It+be+形容词+that从句(obvious, true, surprising, good, wonderful, funny, possible
6、, likely, certain, probable, etc.)如：It is certain that she will do well in her exam. B. It+be+名词词组+that从句(an honour, a fact, a pity, etc）如：Itisapity/shamethat...遗憾的是……Itisasurprisethat…令人惊奇的是… Itisafactthat……是事实Itiscommonknowledgethat……是常识It’s a pity that we can’t go. C. It+be+过去分词+that从
7、句(said, reported, thought, expected, decided, announced, etc。）如：It is said that Mr. Green has arrived in Beijing. D. It+不及物动词或短语+that从句(seem，happen,doesn’t matter,turnout）。如：It happened that I was out that day. It d
