it 用法公开课

一、用来表示时间、天气、地点、距离、环境、形势、还可指未知的人等。例如：⒈Itistwomilestothebeach.⒉Itwasraininginthemorning.⒊Ifit’sconvenient,Icanseeyoutomorrow.⒋Itwasverynoisyattheverymoment.⒌Someoneisknockingatthedoor.Goandseewhoitis.it表示时间常用于句型：1、⑴Itis/hasbeen＋一段时间＋since从句（用一般过去时态）⑵Itwas＋一段时间＋since从句（用过去完成时态）用meet的适当形式填空例如：1）Itis/hasbeenmanyyearssinceIyoulastinLondon.2）ItwasalongtimesinceIyoulastinLondon.methadmetItisfivemonthssinceIarrivedinNewYork.我到纽约已经五个月了。ItisfivemonthssinceIwasinNewYork.我离开纽约已经五个月了。（注意：终止性动词表示从动作发生时算起；如果是状态动词或持续性动词，则从动作或状态结束时算起。）2、⑴Itis/willbe+一段时间+before从句(用现在时态)⑵Itwas+一段时间+before从句（用一般过去时态）表示“在（做某事）前过了多长时间”，或“过了多长时间才……”。如：Butit________morethan100yearsbeforethecountrybeginsonceagaintolookasitdidbefore.willbe二、用作人称代词，代替前文提到过的事物如：Thetrainhasarrived.Itarrivedhalfanhourago.注：区分itonethat1.Iwasdisappointedwiththefilm，Ihadexpected_______tobemuchbetter．A．thatB．thisC．oneD．it2.IpreferaflatinInvernessto_______inPerth,becauseIwanttolivenearmyMom's.A.oneB.thatC.itD.this3.Theairofasuburbiscleanerthan__ofacity.A.oneB.thatC.itD.those三、指代不定式、动名词、从句等，用作形式主语或形式宾语。如：⑴Itisnoteasytofinishtheworkintwodays.⑵Itisnousecryingoverspiltmilk.⑶Itisapitythatyoudidn’treadthebook.⑷Ithinkitnousearguingwithhim.⑸IfounditveryinterestingtostudyEnglish.⑹Hemadeitclearthathewasnotinterestedinthatsubject.注意：it用在不能直接跟宾语从句的动词，尤其是表示好、恶的动词，如：enjoy,like,hate,can’thelp,appreciate,seeto(注意到，务必)1.Iwillappreciateitifyouhelpme.2.pleaseseetoitthatyoubringenoughmoneywhenyougoout.1.Wemustmake___tothepublicthatsomethingshouldbedonetostoppollution.A.WhatisclearB.itisclearC.itclearD.thatclear2.Ihate__whenpeopletalkwiththeirmouthsfull.A.itB.thatC.theseD.them3.___onedaytheywillhaveenoughanimalstosetthemfree.A.ItishopedforB.whatishopedthatC.AsishopedthatD.Itishopedthat四、it用来引起强调句型⑴Itis/was+被强调的部分+that/who…⑵Is/Wasit+被强调的部分+that/who…?⑶特殊疑问词+is/wasitthat/who…?Ididn’tmeetherinthestreetuntilMay.ItwasinthestreetthatIdidn’tmeetheruntilMay.ItwasnotuntilMaythatImetherinthestreet.比较：⑴Itisinasmallfactorythatmybrotherisgoingtowork.(强调句型)⑵Itisasmallfactorywheremybrotherisgoingtowork.（定语从句）1.Itwasintheschool,___Ioncestudied,___weheldaparty.A.when/thatB.inwhich/thatC.that/whereD.that/inwhich2.Itwasfiveo'clockintheafternoon___theyclimbeduptothetopofthemountain．A．sinceB．whenC．thatD．until3.--____yougottoknowItraveledtotheUSA?---Throughoneofyourcolleagues.A.WhereitwasthatB.WhenitwasthatC.HowwasitthatD.Whywasitthat综合练习1.AsthebusiestwomaninNorton,shemade_____herdutytolookafteralltheotherpeople'saffairsinthattown.A.thisB.thatC.oneD.it2.___isourbeliefthatimprovementsinhealthcarewillleadtoastronger,moreprosperouseconomy.(2006浙江)A.WhatB.ThatC.ThisD.It3.I'dappreciate_____ifyouwouldliketoteachmehowtousethecomputer.A.thatB.itC.thisD.you(2006山东)4.Idon‘tlikeworkinglateintothenight,butIcan’thelp_____.A.soB.thatC.itD.them.5.Thedoctoradvisedstronglythatsheshouldtakeaholiday,but____didn'thelp.A.itB.sheC.whichD.he6.Carsdocauseussomehealthproblems–infactfarmoreserious_____thanmobilephonesdo.A.oneB.onesC.itD.those7.---Hewasnearlydrownonce.---Whenwas_____---______wasin1998whenhewasinmiddleschool.A.that;ItB.this;ThisC.this;ItD.that;This8.Meetingmyuncleafteralltheseyearswasanunforgettablemoment,_____Iwillalwaystreasure.A.thatB.oneC.itD.what(2002全国)含有“Itis…”的句型1.Itistime(forsb.)todosth.Itis(high)timethatsb.did/shoulddosth.2.Itis+形容词（+of/forsb.）+todosth.通常用of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。3.Itis+形容词+that+sb.+(should)dosth.（虚拟语气）能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。有时可省去should而直接用动词原形。①Itisimportantthatweshouldpaycloseattentiontograin.②Itisnaturalthathe（should）sayso.4.Itisnouse/good+doingsth.Itisnousetryingagain=Itisofnousetotryagain.5.Itissaid/reported/announced/(well)known/believed…that…Itisbelievedthatpropermorningexercisesaregoodforourhealth.6.Itis/was/willbethefirst/second/third…timethat…①ItisthefirsttimethatIhavebeenhere.②Itwasthesecondtimethathehadseenthefilm.7.Itisuptosb.todosth…应由某人做某事。Itisuptoyoutodecidewhetherwestartornot.