名词性从句--主语从句

名词性从句（一）名词性从句主语从句宾语从句同位语从句表语从句主语从句•把两句话合并成一句话1.Tomwillwinthetennisgame.Itseemsimpossible.ThatTomwillwinthetennisgameseemspossible.主语连系动词表语ThatTomwillwinthetennisgameseemspossible.连系动词表语主语从句主句•主语从句：在主句中担当主语的是一个从句，这个从句就叫主语从句。•引导词：从属连词：that,whether•关系代词：who,whom,what•which,whose•关系副词：when,where,why由that引导主语从句例句：把两句话合并成一句话1.Lighttravelsinstraightlines.Itisknowntoall.Thatlighttravelsinstraightlinesisknowntoall.2.Weshouldwashourhandsbeforemeals.Itisnecessary.Thatweshouldwashourhandsbeforemealsisnecessary.由that引导主语从句•把两句话合并成一句话3.Everystudentshouldhaveastudyplan.Itisnecessary.Thateverystudentshouldhaveastudyplanisnecessary.4.Studentssayhellototheirteachers.Itispolite.Thatstudentssayhellototheirteachers.ispolite.由that引导主语从句•把两句话合并成一句话5.Yourmotherdidn’tattendthepartyyesterday.Itisapity.Thatyourmotherdidn’tattendthepartyyesterdayisapity.6.Tomstolehisclassmate’smoney.Itisafact.ThatTomstolehisclassmate’smoneyisafact.由that引导主语从句•把两句话合并成一句话7.Therewillberainytomorrow.Itispossible.Thattherewillberainytomorrowispossible.8.Teenagerssmoke.Itiswrong.Thatteenagerssmokeiswrong.由whether（“是否”）引导的主语从句1.Willhegoabroad?Itisnotknown.Whetherhewillgoabroadisnotknown.2.Willitraintomorrow?Itisnotknown.Whetheritwillraintomorrowisnotknown.3.Isheapoliceman?Itisnotclear.Whetherheisapolicemanisnotclear.4.Isthefilmstarhappy?Itisnotclear.Whetherthefilmstarishappyisnotclear.由whether（“是否”）引导的主语从句•在主语从句中只能用whether（是否），此意义时不能用if替换。形式主语It代替that主语从句ThatwestudyEnglishwellisnecessary.ItisnecessarythatwestudyEnglishwell.形式主语真正主语第一种：形式主语It代替that主语从句1.Itis+名词+that从句Itisapitythat…Itisashamethat…Itisafactthat….Itisanhonorthat….等等形式主语It代替that主语从句1.ThatJohnwonagoldmedalisafact.ItisafactthatJohnwonagoldmedal.2.ThatImissedthebeginningofthefilmisapity.ItisapitythatImissedthebeginningofthefilm.3.Thatwewillgotravellingisgoodnews.Itisgoodnewsthatwewillgotravelling.4.Thatmymotherlosthernewwalletisapity.Itisapitythatmymotherlosthernewwallet.5.ThatMarrymarriedablindmanisapity.ItisapitythatMarrymarriedablindman.6.ThatMarrytoldalietoherhead-teacherisasurprise.ItisasurprisethatMarrytoldalietoherhead-teacher.第二种：形式主语It代替that主语从句•Itisimportantthat…•Itisnecessarythat…•Itispolitethat….•Itiswrongthat…等等Itis+形容词+that…把两句话合并成一句话例句ThatlighttravelsinstraightlinesisrightItisrightthatlighttravelsinstraightlines.Thathegotagoldmedalisreal.Itisrealthathegotagoldmedal.把下列句子用it做形式主语1.ThatTomwillwinthegameispossible.ItispossiblethatTomwillwinthegame.2.Thatweshouldwashourhandsbeforemealsisnecessary.Itisnecessarythatweshouldwashourhandsbeforemeals.3.Thatwemustcompletethisworkbefore5o’clcockisnecessary.Itisnecessarythatwemustcompletethisworkbefore5o’clcok.第三种：形式主语It代替that主语从句It+不及物动词+that…1)ThatImetmyGeographyteacherinthestreethappened.IthappenedthatImetmyGeographyteacherinthestreet.2)ThatIpickedaredwalletonthewaytoschoolhappened.IthappenedthatIpickedaredwalletonthewaytoschool.3)Thatthemanagerandthebosswenttravellinghappened.Ithappenedthatthemanagerandthebosswenttravelling.第四种:形式主语It代替that主语从句•It+be+过去分词+that…•Itissaidthat…据说…..•Itisreportedthat据报道…•Itisknowntoallthat….众所周知….•Itisbelievedthat….人们相信…•Itisthoughtthat….人们认为….It+be+过去分词+that…1.ThathisfatherhasgonetoTianjinissaid.ItissaidthathisfatherhasgonetoTianjin.2.Thattenpersonsdiedintheaccidentisreported.Itisreportedthattenpersonsdiedintheaccident.3.Thattheearthwasnotroundwasbelievedinancienttimes.Itwasbelievedinancienttimesthattheearthwasnotround.It+be+过去分词+that…4.ThatitwillraintomorrowisbelievedItisbelievedthatitwillraintomorrow.5.Thatthewaiterworkshardisthought.Itisthoughtthatthewaiterworkshard.6.ThattheAmericanpresidentwillvisitChinaisreported.ItisreportedthattheAmericanPresidentwillvisitChina.that省略问题Thatitwillraintomorrowisbelievedthat放句首不能省略Itisbelievedthatitwillraintomorrow.that放在句尾不省略，但偶尔在口语中有省略的。关系代词：whatwhichwhowhom等引导主语从句例句Whomdidtheboyhelp?Sheisanoldwoman.Whomtheboyhelpedisanoldwoman.Wheredoeshelive?ItisBeijing.WherehelivesisBeijing.关系代词：whatwhichwhowhom等引导主语从句把两句话合并成一句话1.Whatdotheirparentsneed?Itismoreexperience.Whattheirparentsneedismoreexperience.2.WhichdoctorswillbesenttoWenchuan?Ithasnotbeendecided.WhichdoctorswillbesenttoWenchuanhasn’tbeendecided.3.Whatcolordoesthegirllike?Itispink.Whatcolorthegirllikesispink.关系代词：whatwhichwhowhom等引导主语从句把两句话合并成一句话4.Whatdidhelose?Itisabrownhandbag.Whathelostisabrownhandbag.5.WhichteacherwillteachthestudentsGeography.Ithasn’tbeendecided.WhichteacherwillteachthestudentsGeographyhasn’tbeendecided.关系副词：wherewhywhen引导主语从句1.Wheredidhego?Ithasn’tbeenknown.Wherehewenthasn’tbeenknown.2.Whyishelateforschool?Itisnotclear.Whyheislateforschoolisnotclear.3.Whendoestheplanetakeoff?Itisclear.Whentheplanetakesoffisclear.4.Wheredoesheoftengoforawalk?Itisinthepark.Whereheoftengoesforawalkisinthepark.关系副词：wherewhywhen等引导主语从句1.Whyisthebabycrying？Ithasnotbeenknown.Whythebabyiscryinghasnotbeenknown.2.Howshouldhedoit?ItisstillaproblemHowheshoulddoitisstillaproblem.3.Wheredidheputthebox?Itisonthetable.Whereheputtheboxisonthetable.4.Whendoeshismothergohome？Itis5o’clock.Whenhismothergoeshomeis5o’clock.