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单元语法专练语法精讲代词it的用法1.it作人称代词的用法。(1)指事物。it可指代除人以外的一切事物或动物。例如:—Whereisthecat?猫在哪?—It'sinthebedroom.它在卧室里。(2)指人。it可用于指代性别不明的婴儿或用于确认某人的身份。例如:Isitaboyoragirl?是男孩还是女孩?Thereisaknockonthedoor.Itmustbethepostman.有人在敲门。一定是邮递员。语法精讲(3)代替某些代词。it还可用于代替指示代词this,that以及复合不定代词something,anything,nothing等。例如:—What’sthis?这是什么?—It’sapresentforyou.这是给你的礼物。语法精讲2.it作非人称代词的用法。it主要用于指代时间、距离、价值、天气、气候及温度等自然现象。例如:It's7o'clocknow.现在7点钟。—Howfarisitfromheretothestation?这里离车站多远?—It'sabouttwokilometres.大约两千米。语法精讲3.it作形式主语或形式宾语的用法。(1)it作形式主语。当不定式、动名词、从句等成分作句子主语时,通常把真正的主语放在句末,而在句首用it作形式主语。①It+be+adj.+for/ofsb+todosth意为“某人做某事……”。例如:Itishardforhimtomakeuphismind.他很难下定决心。②Ittakes/tooksb+时间段+todosth意为“某人做某事花了多长时间”。例如:Ittookmeamonthtogetridofmysmoking.我花了一个月时间才把烟戒掉。③Itissaid/reportedthat...意为“据说/据报道……”。例如:Itissaidthathewillstudyabroad.据说他要出国学习。语法精讲(2)it作形式宾语。当不定式、动名词、从句等复杂成分作宾语,且其后跟有宾语补足语时,通常会在宾语补足语前用it作形式宾语,而将真正的宾语移至句末。其结构为“主语+谓语+it+宾语补足语+不定式/动名词/从句”。例如:Ifinditdifficulttodothejobwell.我发现做好这项工作不容易。语法精练Ⅰ.单项填空(A)1.Ican’tfindmyticket.IthinkImusthavelost.A.itB.oneC.thisD.them(B)2.Whenwegottotheparkyesterday,startedraining.A.thatB.itC.thisD.there(C)3.Televisionshavemadepossibleforustowatchmoviesathome.A.thatB.thisC.itD.they(C)4.Ifindnecessarytolearnaboutthecustomsofacountrybeforeyougothere.A.thatB.thisC.itD.one(A)5.Itisimportantpeoplegoodmanners.A.for;tolearnB.of;tolearnC.for;learnD.of;learn语法精练Ⅱ.按要求完成句子,每空一词1.It’saniceday.(改为反义疑问句)It’saniceday,isn’tit?2.SummerisveryhotinJiangsu.(用it改写句子)Insummer,it’sveryhotinJiangsu.3.Iwenttoschoolat8:00thismorning.(用it改写句子)Itwas8:00whenIwenttoschoolthismorning.4.IfinditisdifficulttolearnEnglishwell.(改为同义句)IfinditdifficulttolearnEnglishwell.5.Playingfootballwithyouisinteresting.(改为同义句)It’sinterestingtoplayfootballwithyou.语法精练Ⅲ.选择适当的代词(it,one,that)填空1.Itisnevertoooldtolearn.2.Thereisonenewspaperleft,andwouldyouliketobuyit?3.Hehasnochild,sohewantstoadopt(领养)one.4.Thisworkismuchharderthanthatone.5.Ihavea100-dollarbillandIwillgiveittoyou.