名词性从句复习it作形式主语课件

Module3Unit2Grammarandusage1AModule3Unit2GrammarandusaLearninggoalslearnthatthepreparatorysubject/emptysubjectitisoftenusedtobalancethesentencewithalongsubject.Theemptysubjectitactsasitsgrammaticalsubjectandtherealsubjectisattheendofthesentence.2ALearninggoalslearnthatthepThatweshouldimproveouroralEnglishisimportant.ItisimportantthatweshouldimproveouroralEnglish.preferablecorrectWhichoneisbetter?3AThatweshouldimproveouroraPreparatorysubject"it"Readthenotesonpage30.4APreparatorysubject"it"ReadtPreparatorysubjectit

形式主语it通常情况下，当句子的主语很长（是从句,动词不定式或动名词短语时），我们一般用it作形式主语，让句子结构更加平衡，避免头重脚轻。形式主语it在语法上起到主语的作用，而句子的真正的主语则在句尾。

5APreparatorysubjectit形式主语it5Awhenweuseanounclauseasthesubjectofasentence.当句子的主语是从句时，我们一般用it作形式主语。a.(correct)Thatlanguagesborrowwordsastheyaredevelopingisinevitable.=(preferable)Itisinevitablethatlanguagesborrowwordsastheyaredeveloping.b.(correct)Whether“borrowedwords”aregoodorbadremainsaquestion.=(preferable)Itremainsaquestionwhether“borrowedwords”aregoodorbad.1.Wecanuseitasanpreparatorysubject.6AwhenweuseanounclauseastPreparatorysubject“it”:1.ThatwewouldbenotabletounderstandOldEnglishtodayiscertain.=ItiscertainthatwewouldnotbeabletounderstandOldEnglishtoday.2.WhetherEnglishwillcontinuechanginginthefutureiseasytoanswer.=ItiseasytoanswerwhetherEnglishwillcontinuechanginginthefuture.3.Whenwecansetoffdependsontheweather.=Itdependsontheweatherwhencanwesetoff.7APreparatorysubject“it”:1.Tha(correct)Tomasteraforeignlanguageishard.(preferable)Itishardtomasteraforeignlanguage.b.(correct)TogainaccesstotheInternetisimportantforus.(preferable)ItisimportantforustogainaccesstotheInternet.B.whenthesubjectisato-infinitive.当句子的主语是不定式时，我们一般用it作形式主语。8A(correct)TomasteraforeignC.whenthesubjectisav-ingform.当句子的主语是动名词v-ing时，我们一般用it作形式主语。a.(correct)Itisdifficulttostopsmoking.=(preferable)Smokingisdifficulttostop.b.(correct)IttakesalotofmytimetravellingtoBeijing.=(preferable)TravellingtoBeijingtakesupalotofmytime.9AC.whenthesubjectisav-ingWeusuallyusethepreparatorysubjectit

withaclauseorto-infinitive(preferable),butwiththev-ingformweprefertherealsubjectatthebeginning.

通常情况下，当句子的主语是从句或动词不定式时，我们一般用it作形式主语。当句子主语是动词的-ing形式时，我们则一般将真正的主语置于句首，而不使用it作形式主语。Tip10AWeusuallyusethe2.当seem,appear,happen,turnout和prove在句子中作谓语动词时，我们也可以使用形式主语it。Itseemsthathespeakstwolanguages.=Heseemstospeaktwolanguages.b.Mynewneighborhappenstocomefrommyhometown.=Ithappensthatmynewneighbor

comesfrommyhometown.11A2.当seem,appear,happen,turn3.在Itisknown...;Itissaid...;Itishoped...;Itisbelieved...等句型中。如:

Itissaidthatourschoolfootballteamwon.·

主语从句也可以用it作形式主语,以wh-连接的句子作真实主语,放到句子后面.如:

Itisstillaquestionwhenweshallhaveoursportsmeet.

Itdoesn'tmatterwhatyousay.12A3.在Itisknown...;Itissai4.Itis/was+被强调部分+that/who...

该句型是强调句型。被强调部分可以是主语、宾语、表语或状语。强调的主语如果是人，that可以由who换用。如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。

ItisonTuesdaythatshewillcome.13A4.Itis/was+被强调部分+thatFinishexercisesA&B,page3114AFinishexercisesA&B,page31ThekeytoExerciseA(2)Itrequiresagoodunderstandingoftheirbehaviortoknowwhattheymean.(3)Italwayspuzzlesmewhymydogbarksincertainways.(4)Itwon’tbedifficulttobuyamachinelikethis.15AThekeytoExerciseA(2)ItreThekeytoExerciseB2.IthappensthatseveralracialgroupsliveinSingapore.3.Itisfuntoheardifferentpeoplespeakingdifferentlanguagesallatthesametime.4.ItiscertainthatI’llseeyounextweek.16AThekeytoExerciseB2.Ithap高考链接1.Itwasneverclear_______themanhadn’treportedtheaccidentsooner.(2011江苏)A.thatB.how C.when D.whyD2.I’mafraidhe’smoreofatalkerthanadoer,whichis______heneverfinishesanything.(2011山东)A.thatB.whenC.whereD.whyD17A高考链接1.Itwasneverclear____3.Beforeaproblemcanbesolved,itmustbeobvious_______theproblemitselfis.(2011湖南)A.whatB.thatC.whichD.whyA18A3.Beforeaproblemcanbesol4.（2012上海卷）—We'veonlygotthissmallbookcase.Willthatdo?—No,______Iamlookingforissomethingmuchbiggerandstronger.whoB.thatC.whatD.whichC19A4.（2012上海卷）—We'veonlygotthi5.（2012全国卷）Itisbynomeansclear____thepresidentcandotoendthestrike.A.howB.whichC.thatD.whatD20A5.（2012全国卷）Itisbynomeansc6.(2013湖南)Donotletanyfailuresdiscourageyou,foryoucannevertell_______closeyoumaybetovictory.A.howB.thatC.whichD.where7.(2013四川)_______yousaidatthemeetingdescribesabrightfutureforthecompany.A.WhenB.HowC.WhatD.ThatAC21A6.(2013湖南)DonotletanyfaiHomework:Workbook:C1(Page100)22AHomework:Workbook:C1(Page10Module3Unit2Grammarandusage23AModule3Unit2GrammarandusaLearninggoalslearnthatthepreparatorysubject/emptysubjectitisoftenusedtobalancethesentencewithalongsubject.Theemptysubjectitactsasitsgrammaticalsubjectandtherealsubjectisattheendofthesentence.24ALearninggoalslearnthatthepThatweshouldimproveouroralEnglishisimportant.ItisimportantthatweshouldimproveouroralEnglish.preferablecorrectWhichoneisbetter?25AThatweshouldimproveouroraPreparatorysubject"it"Readthenotesonpage30.26APreparatorysubject"it"ReadtPreparatorysubjectit

形式主语it通常情况下，当句子的主语很长（是从句,动词不定式或动名词短语时），我们一般用it作形式主语，让句子结构更加平衡，避免头重脚轻。形式主语it在语法上起到主语的作用，而句子的真正的主语则在句尾。

27APreparatorysubjectit形式主语it5Awhenweuseanounclauseasthesubjectofasentence.当句子的主语是从句时，我们一般用it作形式主语。a.(correct)Thatlanguagesborrowwordsastheyaredevelopingisinevitable.=(preferable)Itisinevitablethatlanguagesborrowwordsastheyaredeveloping.b.(correct)Whether“borrowedwords”aregoodorbadremainsaquestion.=(preferable)Itremainsaquestionwhether“borrowedwords”aregoodorbad.1.Wecanuseitasanpreparatorysubject.28AwhenweuseanounclauseastPreparatorysubject“it”:1.ThatwewouldbenotabletounderstandOldEnglishtodayiscertain.=ItiscertainthatwewouldnotbeabletounderstandOldEnglishtoday.2.WhetherEnglishwillcontinuechanginginthefutureiseasytoanswer.=ItiseasytoanswerwhetherEnglishwillcontinuechanginginthefuture.3.Whenwecansetoffdependsontheweather.=Itdependsontheweatherwhencanwesetoff.29APreparatorysubject“it”:1.Tha(correct)Tomasteraforeignlanguageishard.(preferable)Itishardtomasteraforeignlanguage.b.(correct)TogainaccesstotheInternetisimportantforus.(preferable)ItisimportantforustogainaccesstotheInternet.B.whenthesubjectisato-infinitive.当句子的主语是不定式时，我们一般用it作形式主语。30A(correct)TomasteraforeignC.whenthesubjectisav-ingform.当句子的主语是动名词v-ing时，我们一般用it作形式主语。a.(correct)Itisdifficulttostopsmoking.=(preferable)Smokingisdifficulttostop.b.(correct)IttakesalotofmytimetravellingtoBeijing.=(preferable)TravellingtoBeijingtakesupalotofmytime.31AC.whenthesubjectisav-ingWeusuallyusethepreparatorysubjectit

withaclauseorto-infinitive(preferable),butwiththev-ingformweprefertherealsubjectatthebeginning.

通常情况下，当句子的主语是从句或动词不定式时，我们一般用it作形式主语。当句子主语是动词的-ing形式时，我们则一般将真正的主语置于句首，而不使用it作形式主语。Tip32AWeusuallyusethe2.当seem,appear,happen,turnout和prove在句子中作谓语动词时，我们也可以使用形式主语it。Itseemsthathespeakstwolanguages.=Heseemstospeaktwolanguages.b.Mynewneighborhappenstocomefrommyhometown.=Ithappensthatmynewneighbor

comesfrommyhometown.33A2.当seem,appear,happen,turn3.在Itisknown...;Itissaid...;Itishoped...;Itisbelieved...等句型中。如:

Itissaidthatourschoolfootballteamwon.·

主语从句也可以用it作形式主语,以wh-连接的句子作真实主语,放到句子后面.如:

Itisstillaquestionwhenweshallhaveoursportsmeet.

Itdoesn'tmatterwhatyousay.34A3.在Itisknown...;Itissai4.Itis/was+被强调部分+that/who...

该句型是强调句型。被强调部分可以是主语、宾语、表语或状语。强调的主语如果是人，that可以由who换用。如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。

ItisonTuesdaythatshewillcome.35A4.Itis/was+被强调部分+thatFinishexercisesA&B,page3136AFinishexercisesA&B,page31ThekeytoExerciseA(2)Itrequiresagoodunderstandingoftheirbehaviortoknowwhattheymean.(3)Italwayspuzzlesmewhymydogbarksincertainways.(4)Itwon’tbedifficulttobuyamachinelikethis.37AThekeytoExerciseA(2)ItreThekeytoExerciseB2.IthappensthatseveralracialgroupsliveinSingapore.3.Itisfuntoheardifferentpeoplespeakingdifferentlanguagesallatthesametime.4.ItiscertainthatI’llseeyounextweek.38AThekeytoExerciseB2.Ithap高考链接1.Itwasneverclear_______themanhadn’treportedtheaccidentsooner.(2011江苏)A.thatB.how C.when D.whyD2.I’mafraidhe’smoreofatalkerthanadoer,whichis______heneverfinishesanything.(2011山东)A.thatB.whenC.whereD.whyD39A高考链接1.Itwasneverclear____3.Beforeaproblemcanbesolved,itm