“疑问词+不定式(短语)”是一个很有用的结构,它的作用相当于一个名词性从句,通常在某些动词(如tell,know,imagine,learn,decided,forget,remember,consider,understand等)后面做宾语,有时也用作主语、表语、同位语等。如:Hedidn’tknowhowtoanswerher.他不知道该怎样回答她。Whentostarthasnotbeendecided.何时动身尚未决定。Idon’tknowwhotoaskadvicefrom.我不知道应向谁征求意见。Wouldyoupleaseadvisemewhichtobuy?你能否告诉我该买哪一个才好?Pleaseexplain(tome)wheretobeginandhowtodoit.请(给我)解释该从哪里开始及该怎么做。Theyexchangedviewsonthequestionofwhomtoelect.他们就该选谁的问题交换了意见。注意:按英语习惯,疑问词why后面通常不接不定式。但在以why或whynot开头的省略型疑问句中,其后可跟不带to的不定式。如:Whygetupsetjustbecauseyougotabadmark?何必因为没有考好就想不开呢?You’relookingtired.Whynottakeaholiday?你一脸倦容,怎么不休假呢?[巩固练习]I.单项填空。()1.I’mgoingonafieldtripbutIhaven’tdecided__________.(2007年河南)A.whattodoB.todowhatC.wheretogoD.togowhere()2.—Thisphysicsproblemistoodifficult.Canyoushowme________,WangLin?—Sure.(2008年陕西)A.whattoworkitoutB.whattoworkoutitC.howtoworkitoutD.howtoworkoutit()3.Excuseme.Wouldyoupleasetellme________buyadigitalcamera?(2007年安徽)A.whattoB.wheretoC.whatIcanD.wherecanIII.用“疑问词+不定式”改写下列句子。4.Howweshoulddoitwasdiscussedlastnight.__________wasdiscussedlastnight.5.Ididn’tknowwhereIshouldgo.Ididn’tknow____________.6.Thedifficultywashowweshouldcrosstheriver.Thedifficultywas____________.III.根据汉语补全下列英语译文。7.何时动身还不知道。____________isunknown.8.我忘了该怎么办。Iforgot___________.9.我可以告诉你哪里可以买到此书。Icantellyou_________.Keys:I.1-3CCBII.4.Howtodoit5.wheretogo6.howtocrosstheriverIII.7.Whentostart8.whattodo9.wheretobuy(get)thisbook