名詞性從句復(fù)習(xí)it作形式主語課件

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

形式主語it通常情況下，當句子的主語很長（是從句,動詞不定式或動名詞短語時），我們一般用it作形式主語，讓句子結(jié)構(gòu)更加平衡，避免頭重腳輕。形式主語it在語法上起到主語的作用，而句子的真正的主語則在句尾。

5APreparatorysubjectit形式主語it5Awhenweuseanounclauseasthesubjectofasentence.當句子的主語是從句時，我們一般用it作形式主語。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.當句子的主語是不定式時，我們一般用it作形式主語。8A(correct)TomasteraforeignC.whenthesubjectisav-ingform.當句子的主語是動名詞v-ing時，我們一般用it作形式主語。a.(correct)Itisdifficulttostopsmoking.=(preferable)Smokingisdifficulttostop.b.(correct)IttakesalotofmytimetravellingtoBeijing.=(preferable)TravellingtoBeijingtakesupalotofmytime.9AC.whenthesubjectisav-ingWeusuallyusethepreparatorysubjectit

withaclauseorto-infinitive(preferable),butwiththev-ingformweprefertherealsubjectatthebeginning.

通常情況下，當句子的主語是從句或動詞不定式時，我們一般用it作形式主語。當句子主語是動詞的-ing形式時，我們則一般將真正的主語置于句首，而不使用it作形式主語。Tip10AWeusuallyusethe2.當seem,appear,happen,turnout和prove在句子中作謂語動詞時，我們也可以使用形式主語it。Itseemsthathespeakstwolanguages.=Heseemstospeaktwolanguages.b.Mynewneighborhappenstocomefrommyhometown.=Ithappensthatmynewneighbor

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

Itissaidthatourschoolfootballteamwon.·

主語從句也可以用it作形式主語,以wh-連接的句子作真實主語,放到句子后面.如:

Itisstillaquestionwhenweshallhaveoursportsmeet.

Itdoesn'tmatterwhatyousay.12A3.在Itisknown...;Itissai4.Itis/was+被強調(diào)部分+that/who...

該句型是強調(diào)句型。被強調(diào)部分可以是主語、賓語、表語或狀語。強調(diào)的主語如果是人，that可以由who換用。如果把這種句型結(jié)構(gòu)劃掉后，應(yīng)該是一個完整無缺的句子。這也是判斷強調(diào)句型與其它從句的方法。

ItisonTuesdaythatshewillcome.13A4.Itis/was+被強調(diào)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高考鏈接1.Itwasneverclear_______themanhadn’treportedtheaccidentsooner.(2011江蘇)A.thatB.how C.when D.whyD2.I’mafraidhe’smoreofatalkerthanadoer,whichis______heneverfinishesanything.(2011山東)A.thatB.whenC.whereD.whyD17A高考鏈接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全國卷）Itisbynomeansclear____thepresidentcandotoendthestrike.A.howB.whichC.thatD.whatD20A5.（2012全國卷）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

形式主語it通常情況下，當句子的主語很長（是從句,動詞不定式或動名詞短語時），我們一般用it作形式主語，讓句子結(jié)構(gòu)更加平衡，避免頭重腳輕。形式主語it在語法上起到主語的作用，而句子的真正的主語則在句尾。

27APreparatorysubjectit形式主語it5Awhenweuseanounclauseasthesubjectofasentence.當句子的主語是從句時，我們一般用it作形式主語。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.當句子的主語是不定式時，我們一般用it作形式主語。30A(correct)TomasteraforeignC.whenthesubjectisav-ingform.當句子的主語是動名詞v-ing時，我們一般用it作形式主語。a.(correct)Itisdifficulttostopsmoking.=(preferable)Smokingisdifficulttostop.b.(correct)IttakesalotofmytimetravellingtoBeijing.=(preferable)TravellingtoBeijingtakesupalotofmytime.31AC.whenthesubjectisav-ingWeusuallyusethepreparatorysubjectit

withaclauseorto-infinitive(preferable),butwiththev-ingformweprefertherealsubjectatthebeginning.

通常情況下，當句子的主語是從句或動詞不定式時，我們一般用it作形式主語。當句子主語是動詞的-ing形式時，我們則一般將真正的主語置于句首，而不使用it作形式主語。Tip32AWeusuallyusethe2.當seem,appear,happen,turnout和prove在句子中作謂語動詞時，我們也可以使用形式主語it。Itseemsthathespeakstwolanguages.=Heseemstospeaktwolanguages.b.Mynewneighborhappenstocomefrommyhometown.=Ithappensthatmynewneighbor

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

Itissaidthatourschoolfootballteamwon.·

主語從句也可以用it作形式主語,以wh-連接的句子作真實主語,放到句子后面.如:

Itisstillaquestionwhenweshallhaveoursportsmeet.

Itdoesn'tmatterwhatyousay.34A3.在Itisknown...;Itissai4.Itis/was+被強調(diào)部分+that/who...

該句型是強調(diào)句型。被強調(diào)部分可以是主語、賓語、表語或狀語。強調(diào)的主語如果是人，that可以由who換用。如果把這種句型結(jié)構(gòu)劃掉后，應(yīng)該是一個完整無缺的句子。這也是判斷強調(diào)句型與其它從句的方法。

ItisonTuesdaythatshewillcome.35A4.Itis/was+被強調(diào)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高考鏈接1.Itwasneverclear_______themanhadn’treportedtheaccidentsooner.(2011江蘇)A.thatB.how C.when D.whyD2.I’mafraidhe’smoreofatalkerthanadoer,whichis______heneverfinishesanything.(2011山東)A.thatB.whenC.whereD.whyD39A高考鏈接1.Itwasneverclear____3.Beforeaproblemcanbesolved,itm