备考2025届高考英语一轮复习考点通关第二部分学透语法突破句法篇专题五三大从句考点二名词性从句

考点二名词性从句一、从属连词连接词that1.在从句中不作成分，也无词义；2.引导宾语从句时可省略；引导主语从句、表语从句、同位语从句时，不行省略。if主要引导宾语从句，有时引导主语从句whether引导主语从句、宾语从句、表语从句、同位语从句asif/asthough引导表语从句because引导表语从句连接代词who（ever），whom（ever），what（ever），which（ever），whose引导主语从句、宾语从句、表语从句、同位语从句连接副词when，where，why，how引导主语从句、宾语从句、表语从句、同位语从句Whatmatterstoamuseumisnothowmanyvisitorsithas，buthowcloseitistopeople’sdailylives.[北京高考，26]Janemovedaimlesslydownthetree-linedstreet，notknowingwhereshewasheading.Pickyourselfup！Courageisdoingwhatyouareafraidtodo.Unfortunately，ImissedthiseventforthereasonthatIhadtovisitmygrandma.点拨学生看到reason，易错填why，但在该句中，空后内容"Ihadtovisitmygrandma"是说明reason的内容，所以空处引导同位语从句，应填that。[江苏高考，21]Byboatistheonlywaytogethere，whichishowwearrived.Whethertheirweddingceremonywillbeheldintheopenairtomorrowdependsontheweather.We’vegotacoupleofparticipantsintheteam.Theproblemiswhocancompletethischallengingtask.二、主语从句1.从句作主语时，主句谓语动词一般用单数。Whatsheofferstoherclassmatesis（be）honestyandhappiness.2.it作形式主语：句型句型中常用的词或词组It＋be＋形容词＋从句clear，certain，obvious，important，likely，necessary，possible等It＋be＋名词（词组）＋从句ashame，apity，anhonour，nowonder，goodnews等It＋be＋过去分词＋从句said，reported，thought，known，believed，expected，concluded等It＋特别动词（短语）＋从句doesn’tmatter，occurstosb.，makesnodifference等Itispossiblethatcaffeinemaycausebirthdefects（缺陷）inhumans，too.Itisapitythatwelostsuchanimportantcustomer.ItisbelievedthattheinsectshavespreadtoEuropebeforecrossingovertosub-SaharanAfrica.Itdoesn’tmatterwhetheryougototheGreatWallorthePalaceMuseum—wehaveenoughtimetoexplorethisamazingcity.三、宾语从句1.it作形式宾语：findIthinkitnecessarythatwedrinkplentyofboiledwatereveryday.Ishallseetoitthatheistakengoodcareofwhenyouareabsent.2.表示情感或看法的形容词后可接宾语从句，如confident，convinced，surprised，anxious等。Iwassurprisedthatsheshouldthrowawaythenecklacefromherboyfriend.3.一般状况下介词后只能接wh-类连接词引导的宾语从句。[江苏高考，26]Wechoosethishotelbecausethepriceforanighthereisdownto$20，halfofwhatitusedtocharge.四、表语从句1.asif/asthough。asif/asthough意为"似乎，仿佛"，其引导的表语从句常位于系动词之后，从句有时用虚拟语气。Ifeltasifwehadknown（know）eachotherforyears.2.because/why。常用于以下句式中：ThisUnlikeordinarypaper-makingwheretreesneedtobecutdown，Daipaperisenvironmentallyfriendly.Thisisbecauseitsrawmaterialistherecyclablebarkofakindoftreesuniquetothearea.五、同位语从句同位语从句前的名词通常是表示抽象意义的名词：fact，news，idea，truth，hope，problem，information，belief，thought，doubt，suggestion，question等。同位语从句用于对这些名词作进一步的说明或说明。IhavesentMissGreenaninvitationtoourparty，butIhavenoideawhethershewillacceptit.Housewarmingpartiesgettheirnamefromthefactthatalongtimeagopeoplewouldactuallybringfirewoodtoanewhomeasagift.六、易混连接词1.that/what在从句中充当成分含义that不充当成分无含义what充当主语、宾语、表语、定语意为"什么，……的事情，什么样的"Contrarytowhatmanypeoplethink，HIVcannotbetransmittedthroughmosquitoes，coughsorsneezes.Don’tbesad.Themostimportantthingisthatwemustlearnfromourmistakesandmoveon.2.whether/if二者在动词后引导宾语从句时，通常可互换，但在下列状况下，只用whether：特别状况例句与ornot干脆连用时Idon’tknowwhetherornottheywillcome.我不知道他们是否会来。作介词的宾语时Everythingdependsonwhetherwehaveenoughmoney.一切都取决于我们是否有足够的钱。引导主语从句且从句位于句首时Whetherthesportsmeetingwillbeheldontimedependsontheweather.运动会是否会按时实行取决于天气。引导同位语从句时Ihavenoideawhetherheiswillingtohelpus.我不知道他是否情愿帮我们。Itremainstobeseenwhetherornotthisideacanbeputintopractice.[天津高考，4]Sheaskedmewhether/ifIhadreturnedthebookstothelibrary，andIadmittedthatIhadn’t.1.WhatmakestheHarbinInternationalIceandSnowFestivalspecialisthescaleofthesculpturesandthebeautifullighting.2.AfterconsideringcarefullywhereIcouldfindmyfirstidealjob，IchoseChina.3.ThenewsspreadquicklyallovertheworldthatMichaelSchumacherrevivedafterbeingseriouslyinjuredfor5years.4.Nowtherouteisnolongerusedforinternationaltradebutmuchhistoryandmanystoriesofwhathappenedontheancientroadremain.5.Whoeverpassesherewouldstoptoadmirethescenery.6.Itwasexpectedthatover100，000peoplewilltakepartinthemassiveparadeinTian’anmenSquareonthemorningofOct.1.7.TheGreenRevolutionisagoodexampleofhowtechnologicaladvancescanhaveagreateffectoneconomicdevelopment.8.Hedidnotseethefilmlastnight.Thatisbecausehehadtohelphislittlesisterwithherhomework.9.Eatwhichevercakeyoulikeandleavetheotherforwho/whoevercomeslate.10.Nowadays，moreandmoreparentsarediscussingwhether/ifmorefreedomandencouragementshouldbeprovidedfortheirchildren.11.Nowadaysconsumersbecomemoreandmorepracticalandonlybuywhattheyneed.12.Thesyrup（糖浆）finallyturnsintoasolidcoating，likethecrystalonthesurfaceofhaws（山楂果）.Thatiswhytheyarealsocalledbingta