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1、英语从句用法小结一、主语从句★定义：主语从句时名词性从句中的一种，指句中的主语是一个完整的句子。★位置：它可以放在主句谓语动词之前，但多数情况下由it作形式主语，而把主语从句放在主句之后。★连词：引导主语从句的连词有that,whether,连接代词有who,what,which,连接副词有when,where,how,why等。★例句：Thatshewasabletocomemadeusveryhappy.Whethershewillcomeornotisstillaquestion.Whatweneedismoretime
2、.Whowillgomakesnodifference.Whichteamwillwinthematchisstillunknown.Whentheywillstartisnotknownyet.Whereshehasgoneisamystery.Howthishappenedisnotclear.Whyhedidthatwasn’t.★引导主语从句的that不作成分，但不能省略。★由it作形式主语，常用句型有：Itis+名词/形容词/过去分词+主语从句Itisstillaquestionwhethershewillcomeo
3、rnot.Itisstrangethatyoushouldlikehim.Itisstillunknownwhichteamwillwinthematch.此外，还有以下常用结构：Itturnedoutthat…结果是…Ithasbeenfoundthat…已经发现…Ithasbeenprovedthat…已经证明…Ithappened/occurredthat…恰好…Itiswell-knownthat…据说…Itissaid/reportedthat…据说/据报道…Itmustbepointedoutthat…必须指出…I
4、tdoesn’tmatterwhether…是否…都没关系Itmakesnodifferencewhether…是否…毫无区别二、表语从句★定义：表语是一个完整的句子。，由引导，有时可省略that.★位置：从句位于系动词之后。★连词：引导标语从句的连词有that，whether,asif,代词who,what,which,副词when,where,how,why等。★例句：Thatfactis(that)sheneverlikedhim.Itcouldbethispartoftheicesheetisnotnecessaril
5、ysensitivetogolbalwarming.这可能是此处的冰层覆盖对全球变暖不那么敏感。Thequestioniswhocancompletethedifficulttask.★注意：用because引导的标语从句仅限于以下一个句型This/That/Itisbecause(that)…Ithinkit’sbecauseyouaredoingtoomuch.主语是reason是，表语从句不能用why或because引导，只能用that.OnereasonwhyHamletissuchasucessfulplayisth
6、atitappealstomanydifferentpeople.表语从句不能用if引导，但可用asif引导。Helookedasifhewasgoingtocry.三、同位语从句★定义：同位语是一个名词，表示与前面名词相同的人或物，如“myfriendJohn”中，John是friend的同位语，theYangtze,thelongestriverofChina”中，river是Yangtze的同位语。同位语从句即表示同位语是一个完整的句子。★位置：同位语从句跟在名词后面，进一步uom该名词的具体内容，或对该名词作进一步解释
7、。★可接同位语从句的名词一般是具有一定内容含义的名词：conclusion,evidence,fact,hope,idea,news,opinion,problem,promise,reason,truth等。★连词：that(不能用which)，连接副词when,how,why,whether,连接代词what.★例句：Hisdelayisduetothefactthatthecarwentwronghalfway.Thenewsthatourteamhaswonthematchistrue.Sheaskedthereaso
8、nwhytherewasadelay.Theproblemwhetherthismaterialcanbeusedinourfactoryhasnotbeensolved.HehasnoideawhataremarkablewomanMaryis.四、同位语从句与定语从句的区
