Unit 7 条件句.docx
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Unit 7 条件句.docx
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Unit7条件句
八上Unit7Memory---Grammar
Conditionalsentences条件句
If引导条件状语从句
(1)If条件句:
表示客观真理或客观事实,两个动词时态一致------一般现在时
Ifyoutakeafishoutofwater(从句),itdies(主句).
Ifyoucoolsteam,itturnsintowater.
If条件从句可以放在前面,也可以放在后面,放前面时,后面常用逗号隔开
Ifyoucoolwater,itturnsintoice.
Itturnsintoiceifyoucoolwater.
(2)if条件句:
有可能性结果发生的行动,在这些句子中,动词的时态是不同的,if引导的条件状语从句中,主句用一般将来时态,从句用一般现在时态(主将从现)
Ifitdoesn’train,we’llhaveapicnictomorrow.
Ifwegobybus,itwillbecheaper.
Ifyoudon'thurry,you’llmissthetrain.
Ifthepictureissilly,strangeandcolourful,youwillrememberitbetter.
IfIhavetime,Iamgoingtovisityou.
Iwillgototheparkifitdoesn’traintomorrow
(3)主祈从现(祈使句+if+一般现在时态)
Putupyourhandsifyouhaveanyquestionstoask.
Ifit'scoldlatertonight,takeyourcoatwithyou.
Don'twaitformeifI'mlate.
(4)主情从现(情态动词+if+一般现在时态)
IfIgetthereearly,Icanseethedoctorquickly.
ImaybuyacarifIpassmydrivingtest.
Ifyougotoanothercountry,youmustobeythelocallaws.
注意:
当主语是you时,if引导的条件状语从句=“祈使句+and/or+简单句”。
and表示顺承,or表示转折,意为“否则”。
Workhard,andyouwillmakegreatprogress.
=Ifyouworkhard,youwillmakegreatprogress.
Takecare,oryouwillfalloffthetree.
=Ifyoudon’ttakecare,you’llfalloffthetree.
Hurryup,oryouwillbelate.
=Ifyoudon’thurryup,youwillbelate.
Unless引导条件状语从句
unless:
如果…不,除非,相当于if…not(助动词或be动词+not)
Unlessyoulistencarefully(从句),youwon’tknowtheanswer.(主句)
=Ifyoudon’tlistencarefully(从句),youwon’tknowtheanswer(主句).
=Youshouldlistencarefully,oryouwon’tknowtheanswer.
Ican'tseeunlessIwearglasses.
=Ican'tseeifIdon'twearglasses.
Unlessyoucanpayyourbills,you’llhavetoleave.
=Ifyoucan'tpayyourbills,you’llhavetoleave.
Youwillmissthebusunlessyouhurryup.
You'llfailyourChemistrytestagainunlessyouworkharder.
Youwillnevergetanywhereunlessyousetyourgoal.
Unlessyouarefriendlytopeople,youwon'tgetonwellwiththem.(与人相处得好)
口诀:
条件句,放在前,逗号要放句中间,条件句,表可能,主将从现很简单,条件句,表事实,主从现在记心间。
拓展延伸:
1.If引导宾语从句,意为“是否”(if=whether),从句用将来时态。
Doyouknowifhewillcomeherethisafternoon?
2.when,assoonas,not...until引导的时间状语从句也是用主将从现。
典型例题
1.—Idon’tknowifhe______.
—Hewillcomeifit______.
A.comes;won’train B.willcome;doesn’train
C.comes;doesn'train D.willcome;won’train
2.Doyouthinkif______anEnglishfilmtomorrownight?
A.isthere B.thereisgoingtohave
C.thereisgoingtobe D.willtherebe
语法针对练习
一、Jointhesentenceswithif.
1.Thetemperaturerisest0100℃.Theroombecomesbright.
2.Youfeelcool.Itrains.
3.Youswitchonthelights.Waterboils,
4.Thegroundgetswet.Youturnontheairconditioner.
5.Youputoilonwater.Youadd5and3,
6.Youget8.Itfloats.
1._______________________________________________________________________
2._______________________________________________________________________
3._______________________________________________________________________
4._______________________________________________________________________
5._______________________________________________________________________
6._______________________________________________________________________
二、Putthesefactsintoconditionalsentenceswithif.
1.例题:
Doctorstreatsickpeople.
Ifyou'readoctor,youtreatsickpeople.
2.Vegetariansdon'teatmeat.
Ifyou'reavegetarian,______________________________________________.
3.Peopleinahotcountrydon'tlikecoldweather.
Ifyoulive______________________________________________________________.
4.Dancershavetobetallandslim.
Ifyou'readancer,_______________________________________________________.
5.Mechanicsunderstandengines.
Ifyou'rea______________________________________________________________.
三、用括号中所给动词的正确时态完成下列句子.
1.If________________(it/rain),_________________(we/not/go)out.We'llstayathome.
2.If________________(theweather/be)nicetomorrow,_________________(we/drive)tothecoast.
3.If__________________(shepost)theletternow,_________________(they/receive)ittomorrow.
4.________________(Fiona/be)angryif________________(John/arrive)herelateagain.
5.________________(I/go)totheirpartyif_________________(I/have)enoughtime.
6.Unless________________(she/pass)thisexam,________________(she/not/get)thisjob.
7.________________(you/learn)alotif________________(you/take)thiscourse.'
8.If_________________(I/get)aticket,________________(I/go)totheconcert.
9.________________(I/buy)thatcameraunless________________(it/cost)toomuch.
10.If________________(you/run)veryfast,________________(you/catch)thebus.
11.________________(I/go)toseethedoctorif________________(I/not/feel)bettertomorrow.
12.If_________________(they/win)thisgame,________________(they/be)thechampion.
13.If__________(you/get)onthetrain,just_____________(relax)alongthewayforthewholejourney.
14.If________________(you/live)inEngland,________________(not/forget)todriveontheleft!
四、选择正确答案。
1.--WillyougotoDavid'sweddingparty?
--Iwon'tgo_________Iaminvited.
A.becauseB.andC.butD.unless
2.Ifyou_________thewater,it_________intogas.
A.boil;turnsB.boil;willturnsC.willboil;turnD.willboil;willturn
3.I_________youifI_________freetomorrow.
A.visit;willbeB.willvisit;willbeC.willvisit,amD.visit,am
4._________youhavelotsofmoney,youcan'tbuythathouse.
A.IfB.BecauseC.UnlessD.Until
5.Youwillfailtheexam_________youdon'tstudyhard.
A.andB.thoughC.butD.if
6.Youwon'tlearnEnglishwell_________youworkhard.
A.unlessB.whenC.ifD.because
7._________youdon'tgotobedearlier,youwillfeeltiredtomorrow.
A.UnlessB.IfC.ThoughD.Until
8.Iwon'tcometoseeyou_________Iamaskedto.
A.unlessB.becauseC.ifD.though
9.Iwon'tleavehereuntilhe_________back.
A.comeB.comesC.willcomeD.came
10.-Wouldyouliketogoshoppingwithustomorrow?
-Sure,_________Iambusy.
A.sinceB.unlessC.whenD.until
11.Shewillcometohelpusifshe_________toobusytomorrow.
A.isB.isn'tC.willbeD.won'tbe
12.--TherewillbeabaseballmatchthisSunday.Wouldyouliketogowithme?
--IfIhavetime,I_________withyou.
A.wentB.willgoC.goD.havewatched
13.IfIfindhisphonenumber,I_________you.
A.tellB.toldC.willtellD.havetold
14.You'dbetterlookupthenewwordinadictionary______youdon'tknowit.
A.ifB.thatC.thoughD.whether
15.Don'ttalkloudlyatthemeeting.Ifyou__________,youwillhavetoleave.
A.areB.doC.didD.can
16.--Theartclubisformembersonly.Youcan'tgoin_________youareamember.
A.unlessB.becauseC.ifD.though
17.--Whywereyoulateagain?
--_________Imissedthebus.
A.UnlessB.IfC.BecauseD.When
18.I'mwaitingformyfriend._________,I'llgoshoppingalone.
A.IfshecomesB.Ifshewillcome
C.Ifshedoesn'tcomeD.Ifshedidn'tcome
19.--Mum,mytoothhurtssomuch.
--Ifyou_________toomanysweets,you_________better.
A.eat;feelB.stopeating;willfeel
C.willeat;feelD.don'teat;feel
20.--Dad,canIhaveanothercake?
--Yes,youcan_________youareafraidof_________fat.
A.unless;gettingB.if;getC.if;gettingB.unless;get
21.—Mikewantstoknowif______apicnictomorrow.
—Yes.Butifit______,we’llvisitthemuseuminstead.
A.youhave;willrain B.youwillhave;willrain
C.youwillhave;rains D.willyouhave;rains
22.---Doyouknowifhe_______toplaybasketballwithus?
---Ithinkhewillcomeifhe______freetomorrow.
A.comes;isB.comes;willbeC.willcome;isD.willcome;willbe
23.—Doyouknowiffinishedthework?
—Notyet.Ifhe,hewillgivemeacall.
A.he’s,willfinishB.he’ll,finishesC.he’s,finishesD.he’ll,willfinish
24.--Mikewantstoknowif_____apicnictomorrow.
---Yes.Butifit_____,we’llvisitthemuseuminstead.
A.youhave;willrainB.youwillhave,willrain
C.youwillhave;rainsD.willyouhave;rains
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