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Goodmorning,everyone!①Itisnevertoooldtolearn.②Itiseasiertofallthantorise.③Itisnousecryingoverspilt(溢出的)milk.④Itneverrainsbutitpours(泼水).Proverbs(谚语)with“It”活到老,学到老。摔倒容易爬起来难。覆水难收。不鸣则已,一鸣惊人。⑤Itiseasytoopenashopbuthardtokeepitalwaysopen.⑥Ittakesthreegenerations(代,辈)tomakeagentleman.创业容易守业难。十年树木，百年树人。Grammar:Useof“It”2020/2/23课文原句再现1.It’sabeautifuldayhereandIamsittingunderthebigtreeattheendofthegarden.2.Yourmothertellsmethatyoustartedsmokingsometimeagoandnowyouarefindingitdifficulttogiveitup.3.Believeme,Iknowhoweasyitistobeginsmokingandhowtoughitistostop.Theuseof“it”1.用作人称代词，代表前文提到的人或事物。1)Who’sit?_________me.2)Lookatthepicture._____isapictureofourschool.It’sIt2.用于代替指示代词this和that。---Isthisjacketyours?---Yes,______is.itReadandanalyzethefollowingsentences.•ItisFridaytoday.•ItwasverycoldlastMonday.•Itisabout8:30now.•Itisabout25kmfromLongxiantoBazi.•ItliesinthesouthofShaoguancity.•Itis40°C!Yougotahighfever!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e.g:______a.Jimisatthedoor．____wantstoseeyou．b.Someoneisatthedoor．____mustbeJim．A.That,ItB.It,HeC.He,ItD.Who,He一般说来，在指代身份或性别明确的人时，通常要根据情况用代词he／she；若是指代身份或性别不明的人，则用代词itBackC1.Ican’tfindmypen.I’mgoingtobuy_____.2.Lifetodayisbetterthan______intheolddays.3.Ican’tfindmypen.Imusthavelost_____.______用来代替不可数名词或单数可数名词，特指。表示“同类不同物”，（只在平级结构或比较级结构或表对比结构中指代前文出现的表特指的可数名词单数或不可数名词。（复数名词用those指代)onethatititonethat_____用来指代前面提到的可数名词，所指的是事物本身；即“同类又同物”;______则用来替代前面出现过的可数名词，泛指，指一类事物中的一个.即“同类不同物”(复数n用ones指代)1.TheParkersboughtanewhousebut___willneedalotofworkbeforetheycanmovein.A.theyB.itC.oneD.which2.We’vebeenlookingathousesbuthaven’tfound___welikeyet.A.oneB.onesC.itD.them3.I’mmovingtothecountrysidebecausetheairthereismuchfresherthan___inthecity.A.onesB.oneC.thatD.those易误辨析:it/one/thatBACthehousethattheParkersboughtahousetheairIt作为形式主语当不定式、动名词、从句等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it.2020/2/23eg:1.Itisillegal（forateenager）todriveacarwithoutalicense.2.Itisnecessaryforyoutogivehimaletter.Conclusion：在句1和句2中it的作用是___________,真正主语是________。形式主语不定式短语（1）It+be+adj.+（forsb.）todosth.此处adj.通常为描述事件的形容词：easy，difficult，hard，necessary，impossible，likely，right，wrong，important，obvious，useful，useless，dangerous…2020/2/23（2）It+be+adj+ofsb.todosth此处adj.通常为描述人的形容词：kind，unkind，nice，rude，cruel(残忍的)，considerate（体贴的，关心的），careless（粗心的），foolish，stupid，wise，crazy（疯狂的）.eg:1.It‘skindofyoutohelpmewiththeproblem.某人做某事某人是…….2It’sfoolishofyoutoquityourjobnow.2020/2/233.Itisnogoodcryingoverspiltmilk.4.Itisnousecastingpearlsbeforeswine.在句3与句4中，it的作用是_________,真正主语是____________.形式主语动名词短语构成如下结构：Itis+nouse/nogood/notanygood/notanyuse+doingsth.Readandanalyzethefollowingsentences.•Itisobviousthatthewaterwastoblame.•Isitpossiblethathewillbecomethechairmanofourcountry?•ItisamazingthatatmyageIstilllooklikeastudent!•Analysis：it是______,句子真正的主语是——____________形式主语that引导的主语从句Conclusion：Itis+____+that从句adj.跟踪训练1：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.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。1.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.有人建议他应该立刻戒烟。Itisafactthatsmokingdoesharmtohealth.Ithappensthatweareinthesamecollege.__________thereisanearthquakeinJapan.Itissaidthat________________heshouldquitsmokingatonce.Itissuggestedthatit作形式宾语1.IfounditveryinterestingtostudyEnglish.我发现学英语非常有趣。2.Ithinkitnousearguingwithhim.我认为和他争吵没有用。3.Hemadeitclearthathewasnotinterestedinthissubject.他非常清楚地表示他对那门学科不感兴趣。小结：it在句中充当_________，真正宾语可以由______以及_________短语充当。还可以由______引导的宾语从句充当。不定式动名词that形式宾语总结：当复合宾语中的宾语是不定式、动名词宾语从句时,往往把真正的宾语放在它的补足语后面，而用it作形式宾语,放在宾语补足语之前。该句型中的it作形式宾语,常用的动词有think,believe,make,find,consider,feel等。1.S+think+it+necessary+(forsb.)todosth.Thechairmanthought___necessarytoinviteProfessorSmithtospeakatthemeeting.A.thatB.itC.thisD.himSentencepatterns:B…find…possiblefeel…important…/clause形式宾语2.S+V+it+one’sduty+(forsb.)todosth./clause3.S+V+it+nogood+doingsth.nouse形式宾语Ithinkithisdutytocleantheblackboard.Sentencepatterns:…aruleanhonour………findpossible1.S+think+it+necessary+(forsb.)todosth./clausefeelimportant……Sentencepatterns:形式宾语…arule2.S+V+it+one’sduty+(forsb.)todosth./clauseanhonour…3.S+V+it+nogood+doingsth.nouseIlike___intheautumnwhentheweatherisclearandbright.A.thisB.thatC.itD.one点拨:这是it作形式宾语的一种特殊用法.少数动词(如like,love,enjoy,dislike,hate,appreciate等)或包含介词的动词短语(如seeto,dependon等)后接宾语从句,必须先由it担任形式宾语,再接从句.1.Ilike(enjoy,hate…)itwhen….2.Iwouldappreciateitif…3.…seeto(dependon…)itthat…Sentencepatterns:C形式宾语It用于强调句型ImetTomintheparkyesterday.1)ItwasIwhometTomintheparkyesterday.2)ItwasTomwhoImetintheparkyesterday.3)ItwasintheparkthatImetTomyesterday.4)ItwasyesterdaythatImetTominthepark.Itis/was+被强调部分+that/who+句子的其他部分Mr.Zhuteachesusmath.ItisMr.Zhuthat/whoteachesusmath.Webeginourclassat7:35inthemorning.Itisat7:35thatwebegin