名词性从句分为主语从句、宾语从句、表语从句和同位语从句。宾语从句1.语述问题 跟随陈述语序如：Theywanttoknowwherehewasborn.✓Whatiswrongwithyou?=whatisthematterwithyou?这个句子不变语序。✓Ijustwanderwhatitisthatmakeshimsoexcited.2.时态(tense)✓如果主语是现在时态，从句的时态可以根据实际情况而定Shetellsmethatshewillcometomorrow.Shetellsmethatshewonthefirstprizeyesterday.✓主语为过去时态，从句的时态一定要用相对应的过去的某种时态。Shetoldmeshewouldwonthefirstprizenextyear.（过去将来时ShetoldmeshehadbeeninBeijingfor3years.（过去元成时）✓从句为客观真理、定义、公理、定理时，用一般现在时Theteachersaidthattheearthtravelsaroundthesun.3.连词1.that:在句子中不作为成分的时候，可以省略。但是有些情况下 that 不能省略：•当动词后，宾语从句不止一个时，第二个起 that 不能省略。Theyknow（that）hewashonestandthathehadnomoney.•当 that 从句被短语或者词组与谓语动词分开时不能省略。Inoticed，forthefirsttime,thatourteacherwaswearingahat.•It 作形式宾语，that 从句做真正宾语时HefindsitnecessarythatheshouldlearnforeignIanguages.•在 wonder/doubt/besure/certain 之后不能省略Iwanderthathefailed.(我很惊讶他失败了)2.where 和 if 之间的区别Idon'tknowwhetherornotwewillhaveanexaminationthisweek.Idon'tknowwhether/ifwewillhaveanexaminationornotthisweek.✓介词后面的宾语从句不能用 if当 whether 后面紧跟着 ornot 时只能用 whether.✓在动词 discuss/doubt 后面只能用 whether.Theyarediscussingwhetherthemeetingshouldbeheld.3.what 引导Themoderncitywasbeautifulinwhatwasawastelandtenyearsago.4.否定转移由 think,believe,imagine,suppose 等词引导的时候，要将宾语从句中的否定形式转移到主句中去。5.例句Wemustpayattentionto(A)makesmistakes.A.whoeverB.whomeverC.nomatterwhoD.nomatterwhom3.在表语从句中不能用 if 作为但是可以用 whether 和 asif 引导。ThereasonisthatThequestioniswhetherheisabletodoit.Itlooksasifitwouldrain.（使用了虚拟语气）4.itis/wasbecause+原因Itisbecausetheweatherwasbad.5.itis/waswhy+结果Itiswhyhewasfailed.6.特殊的表语从句Janeisnolongerwhatshewasfouryearsago.主语从句✓主语从句中 that...
