必修6unit3grammar-it的用法

GrammarTheuseof“it”-------ByLeslieContentsIt用作代词It作形式主语或形式宾语It用于强调句型It作为引导词用于其它句型考点1:it用作代词-Whatdoyouthinkofthemovie?-It’soneofthebestmoviesthatI’veseen.Who’sknockingatthedoor?Itmightbethemilkman.Itcanbeusedaspersonalpronouns(人称代词),referringtotheperson,animalormattermentionedabove,orthepersonwhoyouarenotsureofsex.summary1ItisDecember12todayanditisasunnyday.Thelazysheepdecidestogoforawalktothepark,thoughitistwomilesaway.ItliesinthesouthoftheSheepVillage.ReadthepassageandpayattentiontoitItiswinternowanditis15°C.It'sabout10a.m.anditisquietinthepark,sothelazysheepfallsasleepinthepark.Unluckily,thebigbigWolfgetsclosetohimandcatcheshim.Help!'it'canbeusedasimpersonalpronouns(非人称代词),referringtonotexactthingsbut_____,________,______,_________,______,____________,______,____________etc.dateweathertimedistanceplacetemperatureseasoncircumstanceSummary21.Whoseumbrellaisthat?It'sMary's.2.What'sthis?It'sarose.'it'canbeusedasdemonstrativepronoun(指示代词),referringto'this'or'that'.Summary3Readandanalyzethefollowingsentences.S1.Whatisthis?Itisacellphone.S2.Whatisthat?Itishisdictionary.S3.Whosebookisthis?ItisMrCheng’s.S4.WhereisyourEnglishbook?Itishere.S5.Mycatismissing,Ican’tfinditanywhere.Question:Whatdoes“it”inthesesentencesreferto?Drawaconclusion:it---词性?______可以替代指示代词_____或______.还可以用作人称代词，代__________________Pron.前文提到的事物.that.this.Readandanalyzethefollowingsentences.ItisFridaytoday.ItwasverycoldlastMonday.Itisabout8:30now.Itisabout25kmfromLongxiantoBazi.ItliesinthesouthofShaoguancity.Itis40°C!Yougotahighfever!Question:Whatdoes“it”inthesesentencesreferto?Conclusion:it可以用作非人称代词，表示_____,_____,______,______,______,_____等。DateweathertimedistanceplaceTemperature日期天气时间距离地点温度01020304it与one,that的用法区别itoneitonethatthatit同类同物特指one同类异物泛指可数名词单数that上文提到特指可数名词单数或不可数Ican'tfindmypen.Imusthavelost____.Ican'tfindmypen.I'mgoingtobuy_____.Haveyoufoundyourbook?No,Ihaven'tfound___.Doyouhaveapen?No,Idon'thave____.Lifetodayismorecolorfulthan______inthepast.Thebookonthedeskisbetterthan_________underthedesk.Fillintheblankswithone,ones,it,that,those.(1)—Ican'tfindmywatch.•—Youhaven'tfound______?Ifyouwanttobuyanew______,Isuggestyoubuy______madeinChina.(2)We'vegotabigcupandtwosmall______.(3)Theweightofanelephantismuchgreaterthan______ofatiger.(4)Thebooksonthefirstshelfareeasierthan____________onthesecondshelf.(5)Theboytoldhisstoryand______ofthegirlupstairs.itoneoneonesthatthose/theonesthatConclusion:①指代上文提过的事物时,it指的是同名同物,相当于the＋名词；②one指的是同名异物,表示单数可数名词；复数形式用ones；③that后面常有后置定语,有特指意义,代替不可数名词或单数可数名词；④复数名词用those，相当于theones。考点2:it用作形式主语或形式宾语123学好英语很重要。问他是没有用的。据说她昨天上学迟到了。考点二：“it”usedassubjectItisimportanttolearnEnglishwell.Itisnouseaskinghim.Itissaidthatshewaslateforschoolyesterday.———————————————————---——————————————————————It+be+adj.\n.\p.p.+(forsb.)todosth.doingsth.clauseSentencepattern:formalsubject(形式主语)ItisimportanttolearnEnglishwell.Itisnouseaskinghim.Itissaidthatshewaslateforschoolyesterday.It+be+adj./n./p.p.+clauseItisclear(obvious,true,possible,certain....)that.....Itisimportant(necessary,strange,natural...)that...(shoulddo)Itisapity(ashame,anhonor...)that...Itissaid(reported,believed,known,learned....)that...Itissuggested(ordered,demanded,insisted,commanded...)that...(shoulddo)Itisstrangethat_______________________.他居然会这样说，真是奇怪。Itisagreatpitythat___________________.他居然会这样想，真是一件憾事。Itisnaturalthat___________________________.鸟在树上安歇是很自然的。It’s+adj.(necessary/strange/natural/important/impossible…)/n.(apity/nowonder…)+that从句中的动词要用虚拟,即(should)+Vhe(should)saysohe(should)thinksoabird(should)restintreesReadandanalyzethefollowingsentences.S3.Itisnogoodcryingoverspiltmilk.S4.Itisnousecastingpearlsbeforeswine.在S3与S4中，it的作用是_________,真正主语是_____________.构成如下结构：Itis+nouse(notanyuse)/nogood(notanygood)/worthwhile,awaste,fun等。+doingsth.动名词短语形式主语Itissaidthat…据说……Itisreportedthat…Itissupposedthat…Itishopedthat…Itiswellknownthat…据报导……据推测……希望……众所周知……普遍认为……有人建议……Itissaid(reported....)that...Itissuggestedthat…Itisgenerallyconsideredthat…该句型中的it仍是形式主语，真正主语是that引导的主语从句。小结：it做形式主语It可以在句中充当形式主语，真正主语可以由______引导的主语从句充当，还可以由______以及_________短语充当。that不定式动名词跟踪训练：Itis+adj.+that从句•很明显他已经知道了那个坏消息。•姚明篮球比易建联打得好是肯定的。Itisobviousthathehasknownthebadnews.ItiscertainthatYaomingplaysbasketballbetterthanYijianlian.•1.Itwasurgentthathe_________herimmediately.•A.callsB.calledC.callD.wouldcall•2.Itisstrangethatsuchathing___inyourschool.A.willhappenB.happensC.shouldhappenD.happened1.吸烟危害健康，这是事实。2.碰巧我们在同一间大学。3.据说日本发生了地震。4.劝他戒烟实在浪费时间。Itisafactthatsmokingdoesharmtohealth.Ithappensthatweareinthesamecollege.__________thereisanearthquakeinJapan.Itisawasteoftime_______(try)topersuadehimtogiveupsmoking.tryingItissaidthatReadandanalyzethefollowingsentences.S1.Itisnoteasytostopsmoking.S2.Itwasdifficulttoquit.在S1与S2中，it的作用是_________,真正主语是_____________.形式主语不定式短语Itis+adj.+todosth.Itis+adj.+(forsb.)todosth.Itis+adj.+(ofsb.)todosth.Itiskindofyoutosayso.Readandanalyzethefollowingsentences.S1.Amousebarkedlikeadoganddroveacataway,sohesaidtohisson“Ithinkitimportanttolearnaforeignlanguage.”S2.W