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1、Grammar连词：but,however,although,whilebut:连接两个并列分句Honeyissweet,butthebeestings.Ioughttohavehelpedher,butInevercould.2.连接两个并列成分Theyseethetreesbutnottheforest.Henolongerfeltdisappointed,buthappyandhopeful.3.后接状语Hetriedtosaveit,butinvain.Heglancedabout,butseeing
2、onlytheemptyroom.however1.多插在句子中间1)Hisfirstresponsewastosayno.Later,however,hechangedhismind.2)Salesarepoorthismonth.Theremay,however,beanincreasebeforeChristmas.2.有时也放在句首或句尾I’llofferittoTom.However,hemaynotwantit.YouknowallthisaswellasIdo,however.although,
3、thoughalthough和though都可作连词，引导让步状语从句，意思是“虽然”，“尽管”；在英语里如果用了although或though,就不能再用but,但可以用yet或still.although较正式，多用于句首。though在非正式语体中较为普遍，但在下列用法中，不能用although,要用though.a.表示强调时要用eventhough.b.though可以用在倒装句中。Youngthoughheis,heisquiteexperienced.c.though可以用作副词，表示“然而”,
4、通常放在句末。1)Hesaidhewouldcome.Hedidn’t,though.2)I'veabitofheadache.It'snothingmuch,though.3)Economicsisadifficultsubject.It’sinteresting,though.While常用来引导状语从句，表示对比、让步、时间等Somecountriesarerich,whileothersareextremelypoor.WhileTom’sverygoodatscience,hisbrotherisa
5、bsolutelyhopeless.Whiletheyaremyneighbors,Idon’tknowthemwell.Whilewedon’tagree,wecontinuetobefriends.Strikewhiletheironishot.单项选择1.Johnsaveshismoney,_______Georgespendsallhegets.A.whetherB.asC.thoughD.while2.I’dlovetocome______Ican’tmakeittill8o’clock.A.soB
6、.butC.howeverD.while3._______I’mwritingthis,youcanbedoingsomethingelse.A.BeforeB.AfterC.UntilD.While4.______timeswerechanged,BursleywasstillBursley.A.WhetherB.ThoughC.WheneverD.however5.Thesouthofthecountrygrowsricher,______thenorthgrowspoorer.A.whileB.neit
7、herC.ifD.although6.____heisveryold,heishealthy.A.AsB.HoweverC.ThoughD.Whereas7.Britainisnotmountainous,_____Italyis.A.howeverB.whileC.althoughD.unless8.Hewasfeelingbad.Hewenttowork,______,andtriestoconcentrate.A.howeverB.soC.althoughD.while9.Hepromisedtohel
8、pme.____,heisbusyandhasn’tcome.A.WhileB.AlthoughC.HoweverD.Whether10.She’sbeenlearningItalianforsixyears,______shedoesn’tspeakitverywell.A.forB.soC.butD.as11.Theywantedtocharge$5000forthecar,______wema
