条件状语从句和让步状语从句.ppt

高中第四册条件状语从句常由if,unless,incase(万一，假使),onconditionthat,as/solongas,provided(that),providing(that)(以……为条件)，suppose(that),supposing(that)（假如）等连词引导。注意：1.主句是一般将来时，if，unless等引导的条件状语从句通常用一般现在时表将来e.g.Ifitsnowstomorrow,wewillbuildasnowman.2.If引导的条件状语从句分为：真实条件句和虚拟语气e.g.Ifyoudon’tgoatonce,youwillbelate.(真实)Ifwehadmoretimeyesterday,wecouldhavedonethework.(虚拟)1.As/Solongaswedon’tloseheart,we’llfindawaytoovercomethedifficulty.1.Don’tcomeunlessItelephone.2.Youwillfailunlessyouworkhard.1.Shewillgoprovidedherfriendscangoalso.2.Hewilldotheworkprovidingyoupayhim.有些条件句可省略某些成分或改成短语：1.Ifnecessary,ringmeathome.2.Hewillcomeifasked.3.Hewouldneverdothisunlessforced.引导让步状语从句常用的连词有：though,although,as,while（虽然），evenif,eventhough（即使），whatever（无论什么），wherever（无论哪里），nomatterwh…（无论…）。as引导的让步状语从句，从句用部分倒装adj./adv./n.(无冠词)+as+主谓v.+as+主语+may/might/will/woulde.g.Childasheis,heknowsalot.虽然他是个孩子，他懂得很多。MuchasIadmirehim,Icannotexcusehisfaults.虽然我很崇拜他，可我不能原谅他的错误。2.当有though,although时，后面的从句不能有but，但可与yet可连用。e.g.Althoughit'sraining,theyarestillworkinginthefield.Maryisanicegirl,butshehasoneshortcoming.3.however,whatever,whenever,whoever等引导让步状语从句，相当于nomatterhow,what,when,who….(无论怎样/什么/何时/谁…)e.g.Whateverworkwedo,weshoulddoourbest.Hekeepstakingphysicaltraininginwinternomatterhowcolditis.4.whether…or…(不管……还是…….)whether…ornot（不管是……还是不是）e.g.Allthenationsshouldbeequal,whethertheyarestrongornot.Thankyou!