522平行线的判定(第1课时)-课件-人教版数学-七年级下册

条件状语从句条件状语从句定义：条件状语从句是表示主句动作发生的前提或条件的从句。引导条件状语从句的连词有：if,unless,aslongas,onconditionthat(只要，条件是)，supposing/suppose(that)/providing/provided(that)(如果，假如)，incase,once(一旦)等。定义：注意：if引导的条件状语从句但表示意愿的句子可以用will.eg:Ifitrainstomorrow,we’llnotgototheconcert.eg:Ifyouwillwait,I’lltellthemanagerthatyouarehere.主将从现注意：主将从现(2)unless相当于ifnot,意为“如果…不”；除非；eg:We’llgomountainclimbingunlessthereisrain.=We’llgomountainclimbingifthereisnorain.(2)unless相当于ifnot,意为“如果…(3)so/aslongas,onconditionthat“只要，条件是”eg:As/Solongaswedon’tloseheart,wewillfindawaytoovercomethedifficulty.eg:Icanlendyoumycaronconditionthatyoureturnittomethisafternoon.(3)so/aslongas,onconditi(4)supposing/suppose/providing/provided/given(that)如果eg:Supposing(that)itrains,shallwecontinuethesportsmeeting?eg:Providing/providedthatyouhaveonemilliondollars,whatwillyoudo?(4)supposing/suppose/providin(5)incase“以防；万一”，其后接句子。incaseof后接名词。eg:Pleasecarryanumbrellaincaseitrains.=Pleasecarryanumbrellaincaseofrain.

(5)incase“以防；万一”，其后接句子。让步状语从句让步状语从句定义：让步状语从句表示在某种相反的条件下，主句中的情况依然会出现。常用的引导词有：although,though,as,however,whatever,whoever,whomever,whichever,whenever,wherever,nomatter(who,what,when,etc.),evenif,eventhough,whether…or(not),while(尽管)等。定义：(1)though与although引导让步状语从句不能和but连用，但可与still,yet,nevertheless等adv.连用。(改错)eg:AlthoughIaskedthemtobequiet,buttheydidn’tseemtocare.still(1)though与although引导让步状语从句不stas,though引导的让步状语从句，从句中的表语、状语（副词）或动词等可以提前，作表语的单数可数名词冠词需省略。（请标出倒装的部分）eg:Youngasheis,heknowsalot.eg:Hardasheworks,hemakeslittleprogress.eg:Childasheis,heknowsmuchEnglish.eg:Objectasyoumay,Iwillgo.(反对)YoungHardChildObjectas,though引导的让步状语从句，从句中Young(2)eventhough即使，可与evenif互换。eg:Eventhough/ifyousayso,Idon’tbelieveit.(3)whether…or(not)“不论是否…”eg:Whetheryoubelieveitornot,itistrue.eg:Whethertheweatherisgoodorbad,theywillsetoffasplanned.(2)eventhough即使，可与evenif互换(4)while也经常位于句首，相当于although,“尽管”。eg:WhileIunderstandwhatyoumean,Icannotagreewithyou.(4)while也经常位于句首，相当于(5)引导让步状语从句时，“nomatter+疑问词”与“疑问词+ever”可以互换；引导名词性从句（常考察主语从句，宾语从句），只能用“疑问词+ever”。eg:Youhaveoursupportwhatever/nomatterwhatyoudecide.eg:Nomatterwhocalls,tellhimthatIamout.=Whoevercalls,tellhimthatIamout.eg:Whateverhedidwasright.(5)引导让步状语从句时，“nomatter+疑判断对错Nomatterwhatyousayisofnousenow.Whateveryousayisofnousenow.(主语从句)Idon’tbelievenomatterwholooksawayfrommewhentalking.Idon’tbelievewhoeverlooksawayfrommewhentalking.（宾语从句）×√×√判断对错×√×√注意：nomatterhow=however引导的让步状语从句倒装eg:Howeverlatehegoestobed,healwaysgetsupearly.eg:

Howeverhardheworked,hecouldn’tmakehisteacherhappy.however+adj./adv.+主语+谓语注意：

小试一下！

I’lleat_____yougiveme.

A.whateverB.nomatterwhatC.whereverD.nomatterwhereAA___________comeswillbewelcome.不管谁来都受到欢迎。Whoever无论你说什么,我都不会相信你。____________________________yousay,Iwon’tbelieveyou.Whatever(=Nomatterwhat)___________comeswillbewelcoCompletethesentenceswithwhoever,wherever,wheneverorhowever1.

___________Ifeellonely,Ithinkaboutyou.2.__________heis,heshouldnotberudetome.3._________Igo,Ialwaysmeetinterestingpeople.4.

Youcaninvite________youliketotheparty.WheneverWhoeverWhereverwhoeverCompletethesentenceswithwh5.___________lateyouarrive,I’llcomeandmeet.6.Ifeelshy__________shesayshellotome.

7.

Ihearthatsong_________Iswitchontheradio.8.

__________muchIstudy,Ifindtheseexercisesdifficult.Howeverwhenever

whenever

However5.___________lateyouarri9.---Whatwillyoudoifit___tomorrow?---Wehavetocarryiton,sincewe’vegoteverythingready.ArainBrainsCwillrainDisraining10.____hehaslimitedtechnicalknowledge,theoldworkerhasalotofexperience.ASinceBUnlessCAsDAlthough9.---Whatwillyoudoifit_11.____difficultiestheymaycomeacross,theywillhelponeanothertogetoverthem.AHoweverBWhateverCWhicheverDSince12.Tomisingoodshapephysically___hedoesn’tgetmuchexercise.AifBeventhoughCunlessDaslongas11.____difficultiestheymay13.____DavidsayssoundsrighttoHelen.That’swhyshehasmadeuphermindtobewithhim___happens.AWhatever;whateverBNomatterwhat;whateverCNomatterwhat;nomatterwhatDWhatever;however13.____Davidsayssoundsrigh14.Thisisaveryinterestingbook.I’llbuyit,____.AnomatterhowitmaycostBhowmayitcostChowmuchmayitcostDhowevermuchitmaycost14.Thisisaveryinteresting15.Hetriedhisbesttosolvetheproblem,_____diffic