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1:非谓语做主语非谓语动词作主语谓语动词用单数.动词不定式在句中做主语11To seeis to believe.2To savetime is to lengthenlife.3To liveistowork.4To getup earlytoday isunwise.5To beinvited toyour homeis mygreat honor.)不定式作主语时,可采用作形式主语,而把真正的主语不定2it式后置EG:Its a great honorto beinvited toMarys birthdayparty.It wasimpossible forlost timetobemade up.Its ourduty totake goodcare ofthe old.固定句型形容词+
1.It+be+for sb+to do.形容词+
2.It+be+of sb+to do.用或填空EX:of for1It isdifficult us to finishwriting thecomposition inanhour.2It snecessary you to lockthe carwhen youdo notuseit3It svery kindyoutohelp us.4It isstupid youto writedown everythingthe teachersays.5It wassilly usto believehim.疑问词等后可3who,what,which when,where,whether,howz接不定式,构成不定式短语在句中作主语.什么1When toleave forLondon has not beendecided yet时间动身去伦敦还没决定2How toget therehasnt beendecided.还没决定怎么到那里3Where tohold the meeting is not asimple question.4What tobuy isstill unknown.5How toreach MountTai ismore difficult.6Which tobuy isup toyou.7Whether tohold theparty dependson theweather..动名词在句中作主语:主动式8doing,one sdoing被动式:7being done,one sbeing done动名词作主语和不定式作主语常可互换二者也有区别动名词1作主语时,常表经常性,习惯性的动作和行为而不定式作主语的动作意义较强,多指要是去做某事,这种动作往往是要发生的一次性动作,比较具体.EG:1Seeing isbelieving.Walking is a formof exercising.南方与北Fighting brokeout betweenthe Southand theNorth.方开战了2Cheating onan examruins onescharacter.Talking tohim istalkingto awall.Reading Englishaloud in the morningwill doyoua lotof good.Praising othersis agood habit.3And beingpraised by others makesus proudandexcited.4Punishing studentscarin tbring mehappiness butbeingzpunished canreally makeme feeldown.5Being relaxedmakes iteasier forustostore andremembernew knowledge.Being happyis awise choice.Being confidentdoesa greatdeal ofgood toyour life.动名词的复合结构做主语当动名词有自己的逻辑主语时,常可2以在前面加上一个名词或代词的所有格,构成动名词的复合结构一—这时,名词或代词的所有格做动名词的逻辑主语动名词的复合结构也可以在句中作主语EG:1Theircome tohelp wasa greatencouragement tous.z2Y ouII seethat mypunishyou hasntbeen sobad foryou.3Jack*snotget tothe stationon timemade allof usworried.4His electour chairmanmade usthink alot.动名词作主语时,常用于固定句型3A:It isno good/no use/a wasteof time/worthwhile...doingsth;+从句表不允许、不可能,没必要等B:There isno+doingIIO1It isno usewaitfor himany longer.2It isno usecryover thesplit milk.3It isno goodlearnwithout practice.4It isworthwhile consultyour tutorabout itagain.5It isa wasteof timespendtoo muchmoney onclothes..说不准他会干什么6There isno saywhat hewill bedoing随堂练习7The presidents attendthemeetinghimself encouragesusagreatdeal.78It sno usecomplainwithout takingany action.3laugh atthe poorisnotan actof kindness.4Hislaugh atthe poormakes otherslook downupon him.5laugh atbyotherscauses meto becomepowerful.6bring upinthecountryside madeMr.Smith veryhard-working.7This boysnot learnhard ledto hisfailure inthe end.8know whatyou shoulddo certainlydoes goodto yourfuture.9expose tosunlight fortoo muchtime willdo harmto ourskin.10keep thememory inshape isimportant atany age.二改错:1Admitted toa topuniversity isour commongoal.2Living abroadalone actuallydo goodto ourselves.73It sno useask himto stopsmoking.4Tom beinglate againmade allof usdisappointed.5Students knowingEnglish wellwill helpthem tolearnFrench.6Be punished isaterrible experience.7No beingpunishedisa wonderfulexperience.8Tom scome herewill getus outof trouble.9Being laughat iswhat Ihate most10We mustprotect theearth frompolluted.11I havebeen lookingforward toyour come.。