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1、SimplesentenceCompoundsentenceComplexsentence从句：名词性从句（主语从句，宾语从句，表语从句，同位语从句）形容词性从句(定语从句)副词性从句（状语从句）英语中六大从句用法总结在句子中起名词作用的各种从句，统称为名词性从句1.主语从句subjectiveclause一般由what,who,which,why,how,when,which,whether…or…等引导，如果从句较长，谓语又较短，可用it作形式主语，而将从句放在句末。常见的句型有：Itisself-eviden
2、tthat…很明显的是Itgoeswithoutsayingthat…不用说Itisassertedthat．．．有人主张……Itisbelievedthat．．．据信……Itisgenerallyconsideredthat．．．人们普遍认为……Itishopedthat．．．人们希望……Itisreportedthat．．．据报道……Itissaidthat．．．据说……Itissupposedthat．．．据推测．．．Itiswell-knownthat．．．众所周知……Itmustbeadmittedtha
3、t．．．必须承认……Itcannotbedeniedthat…不可否认……Itmustbepointedoutthat．．．需指出的是……Itwastoldthat．．．据传……Itwillbesaidthat．．．有人会说……Itfollowsthat…由此可见Itisinappropriatethat………是不合适的2)what引导的主语从句表示“...的东西时”，一般不用it作形式主语。Whatwelackisexperience.3)what,who,when,why,whether等词含有各自的疑问意义，
4、但它们引导的主语从句，都用陈述语序。Howtheplanistobecarriedoutshouldbediscussedagain.IdidknowwhyIfeltlikecrying.2.宾语从句objectiveclause1）宾语从句可位于及物动词、介词和某些形容词后。连词that常可省略。介词后一般接疑问词引导的宾语从句。inthat(因为),exceptthat(除了),butthat(只是）已构成固定搭配，其他介词后一般不接that引导的宾语从句。*IpromisedthatIwouldchanget
5、hesituation.*AllthisisdifferentfromwhatAmericanyoungpeoplewouldsayaboutfriendship.*Heiscertainthatwatchingsomuchtelevisionisnotgoodforchildren.*Thisarticleiswell-writtenexceptthatitisabittoolong.Compliment2)宾语从句后如有宾补，要用形式宾语it来代替，而把宾语从句移至宾补之后。Hehasmadeitclearth
6、athewouldnotchangehismind.3)在think,believe,suppose,expect等动词后的宾语从句中，如果谓语是否定的，一般将否定词移至主句谓语上，宾语从句则变成肯定形式。Hedidn'tthinkthatthemoneywaswellspent.1.表语从句PredictiveclauseLinkingverb表语从句出现在结构为“主语+系动词+表语从句”的句子中。表语从句除可用that,what,when,why,whether,how等引导外，还可由because,asif(
7、though)等引导。that常可省略。如主句主语为reason,只能用that引导表语从句，不可用because.PerhapsthemostimportantthingtorememberisthatthereisnoonecommontypeoflifeinAmerica.Thereasonwhysomanypeoplediedthereisthattherewerenotenoughfoodsupplies.Itlooksasifsuccessfulinternationalculturalcommunic
8、ationwillmaketheworldsmaller.4.同位语从句appositionalclause同位语从句用于对前面出现的名词作进一步说明，一般用连词that引导，由于先行名词的意义不同，也可用whether,who,when,where,what,why,how等引导。常见的先行名词有fact,idea,belief,news,hope,con
