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1、名词性从句之主语从句概念：主语从句：从句在句中充当主语成分划出下列句子的主语1).Thathewillsucceediscertain.2）Whetherhewillgothereisnotknown.3)Howwecanhelpthetwinswillbediscussedatthemeeting.一． 引导主语从句的连接词有三类：(1) 从属连词that、whether ：两者在从句中均不作成分，只起连接作用；that无实际意义，whether表示“是否”。Whetherwegobytrainorbyboatma
2、kesnodifference.Whether he’ll come here isn’t clear. Thatpricewillgoupiscertain.(2) 连接代词who, whom, whose, what, which, whoever, whatever, whichever等。在从句中作主语、宾语、表语、定语等成分What she did is not yet known.Whowillwritethepoemhasnotbeendecidedyet.Whateverhedidisright.
3、Whoevermakesmistakesmustcorrectthem.Whateverwassaidheremustbekeptsecret.3) 连接副词 where, when, how, why等。在从句中作时间、原因、地点、方式状语等成分。How this happened is not clear to anyone. Whenhewillbebackdependsontheweather.Howthepyramidswerebuiltisstillamystery.二．主语从句后置为了避免主语冗长,句
4、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.练习1.Thattheearthisroundisknowntoall.-----2.Thatyoumissedthechanceisapity.-----归纳：用it作形式主语的结构A.It+be+adj(obvious, true, natural, surprising, good, , possible, likely, cert
5、ain, probable, etc.)+从句。如：It is certain that she will do well in her exam. Itisuncertainwhowillwinthematchintheend.B.It+be+名词词组(no wonder, an honour, a good thing, a pity, no surprise, etc.)+从句。如：It’s a pity that we can’t go. It’samysterytomewhyhewentthere.A.It
6、+be+过去分词(said, reported, thought, expected，known, etc.)+从句。如：It is said that Mr. Green has arrived in Beijing. Itremainsunkownwhatweshoulddonext.D. It+seem, happen等不及物动词及短语+that从句。如：It happened that I was out that day. E.It+doesn’t matter (makes no difference, e
7、tc.)+连接代词或连接副词引起的主语从句。如：It doesn’t matter whether she will come or not. Itmakesnodifferencewhenshecomes.三.主语从句需注意的问题1.“if”不能引导主语从句，应有“whether”引导。2.主语从句中用陈述语序3.主语从句的“that”一般不能省。4.“what”引导主语从句时，谓语动词：1）常与其后的名词作表语一致2）根据句子的语境而定。1.Whatyouleftareonlyseveraloldbooks.2.W
8、hatyousaidisofgreatimportance.3.Whether he’ll come here isnot clear. 课堂练习1.Ireadaboutitinsomebookorother,doesitmatter_______itwas?（01北京春季)A．whereB．whatC．howD．which2.A
