it做形式主语

.it用作形式主语.1代替主语从句1）Itis+adj.+that从句①Itisclear(obvious，true，possiblecertain....)that.....“清楚（显然，真的，肯定．．．）”Itisveryclearthathe’sroundandtalllikeatree.②.Itisimportant(necessary，right，strange，natural...)that...that后的从句中要用虚拟语气（should+动词原形），should可以省去，建议记住该句型中的形容词。Itisimportantthatwe(should)learnEnglishwell.2）.Itis+v-ed+that从句①Itissaid(reported，learned....)that...据说（据报道，据悉．．．）“。ItissaidthathehascometoBeijing.②.Itissuggested(ordered/demanded/insisted/commanded...)that...主句中的过去分词是表示请求，建议，命令等词时，that后的从句要用虚拟语气（should+动词原形），should可以省；常译为“据建议；有命令．．．）Itissuggestedthatthemeeting(should)beputoff.=HeissaidtohavecometoBeijing.3）.Itisapity(ashame...)that...that后的从句一般用虚拟语气（should+动词原形），should可省去．表示出乎意料，常译为“竟然”。没有这种意义时，则不用虚拟语气。Itisapitythatsuchathing(should)happeninyourclass.Itisapitythatheisill.4).①Itistime(abouttime，hightime)that...该句型中that后的从句应该用虚拟语气，值得注意的是常用过去时态表示虚拟．常译为“是（正是）．．．的时侯．．．”Itistimethatchildrenwenttobed.②Itisthefirst(second...)timethat...“是第一（二）．．．次．．．”。ItisthefirsttimeIhavebeenhere.=ThisisthefirsttimeIhavebeenhere.5).Ithappens(seems，looks，appears)that...该句型中it是形式主语，that引导的是主语从句，主句中的happen，seem等词是不及物动词。Ithappened(sohappened)thathemethisteacherinthestreet.碰巧．．.Itseemsthathewillbebackinafewdays.看来．．．6).Itdoesn’tmatterwhether(if)...该句型中whether(if)引导的从句是真正主语，该句型常译为＂不论（是否）．．．没关系．．．。Itdoesn’tmatteriftheyareold..2.作形式主语替代不定式1).Ittakessb....todosth.＂做．．．要花费某人．．＂IttookthousandsofpeoplemanyyearstobuildtheGreatWall.2).Itiskind(ofsb.)todosth.主句中的形容词必须是能表示逻辑主语特征的形容词。常见的有：bad，brave，careless，clever，cruel，foolish，stupid，wisewrong等。这个句型可以改写为：sb.iskindtodosth.。Itiskindofyoutosayso.=Youarekindtosayso.3).Itisnecessary(forsb.)todosth.常见的形容词有：①important，necessary，natural②easy，safe，common，normal，hard，difficult,dangerous，等。在①中的形容词作表语可以用从句改写，如：Itisimportantforhertocometotheparty.=Itisimportantthatshe(should)cometotheparty.Itisnogood(use)doingsth.该句型中的真正主语是动名词短语，主句中的表语可以是nogood,nouse,uselessItisnogoodlearningEnglishwithoutwritingEnglish.It'suselesstryingtoarguewithShylock..3.作形式主语替代ing形式.Itlooks(seems)asif...常译为，“看起来好象．．．”如果与事实不相符合，则用虚拟语气．Itlooksasifheisill.（真的病了）Itlooksasifhewereill.（没有生病）Itseemedasifheweredying..Itisuptosb.todosth.Itisuptohimtocleanourclassroomtoday.今天应由他做教室清洁。Itisuptoparentstoteachtheirchildrenmanners.该由父母教孩子礼貌。Itisyourturntocleanourclassroomtoday..Itisone’sturntodosth.今天该轮到你做教室清洁。Itisnowonderthathedidn’twanttogo.＝Nowonderhedidn’twanttogo..Itisnowonderthat…在该句型中如果用肯定形式，表示“真奇怪，真是令人惊讶”；Itisawonderthathereusedsuchagoodoffer.真奇怪，他拒绝了这样好的帮助。难怪他不愿去。4.It作形式宾语.Wethinkitimportanttolearnaforeignlanguage.该句型中的it作形式宾语，为了记忆方便我们可称该句型为6123结构。6指主句中常用的动词：think,believe,make,find,consider,feel；1指的是形式宾语it；2指的是宾补的两种形式：形容词或名词；3指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。Wethinkitourdutytocleanourclassroomeveryday.HefeltitimportantlearningEnglishwell.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.……findpossible1.S+think+it+necessary+(forsb.)todosth./thatfeelimportant……Sentencepatterns:形式宾语…arule2.S+V+it+one’sduty+(forsb.)todosth./thatanhonour…3.S+V+it+nogood+doingsth.nouseWethinkitourdutytocleanourclassroomeveryday.Hefeltitnogoodplayingcomputergames.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.该句型中的it是一个形式宾语，表示模糊意思或代替后面that引导的宾语从句。因为在这个句型中的谓语动词都是需要跟宾语的，但又不能直接跟从句作宾语，于是就得在从句前加上一个形式宾语it。.Wearecountingonitthatyouwillcome.常见的短语和动词有：counton(依靠，指望，期盼),seeto(负责),dependon(依靠),relyon(信赖，依靠)等。Ilike___intheautumnwhentheweatherisclearandbright.(04全国)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…)itwhen2.Iwouldappreciateitif…3.…seeto(dependon…)itthatSentencepatterns:C形式宾语）makeit及时赶到;成功;办成Youcanmakeitifyouhurry.Youneedn’tworry;hewillmakeit.）putit说,评价“Heisanhonestman.”Tomputit.Specialnotice:itbevstherebe“是”“有”1.________someoneatthedoor.Ithink________themantodeliverthemilk.2.Let’shurry!________alongwaytogo.3.________noneedtohurry.Westillgetmuchtime.4.________awonderthatherefusessuchagoodoffer.ThereisitisThereisThereisItisItis?Thereis?5.________nodoubtthathehasdonesomethingbad.6.________nopossibilitythathewillcheatus.7.________nogoodarguingwiththeunreasonablewoman.8._________nodifferencebetweenthetwoplans.ThereisThereisItisThereis9._____wasatimewhen…10._____isnodenyingthat…11.____isachancethat…12____usedtobeatreeinthehouse.13.____goeswithoutsayingthat…不言而喻14.___occurredtosbthat…15.__isconvenienttosb.16.When___comestofootball,Iamworse.17.____turnedoutthat…18._____hadn’tbeenfortheexams,Iwouldhavebeenthere.