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•Thegirlcouldvisitthesickkidsinthehospitaltocheerthemup.•Thegirlcouldvolunteerinanafter-schoolstudyprogramtoteachkids.•Theboycouldhelptocleanupthecityparks.一.结构:todo(否定)nottodo动词不定式具有名词、形容词和副词的特性，因此在句中可以作主语、宾语、宾语补足语、定语和状语等。二.用法/功能具体说明Toseeistobelieve.It’simportanttolearn.(1).主语不定式作主语时,有时置于后面,用it作形式主语.Iwanttogohome.Ifounditnecessarytotalktohimagain.(2)宾语think/consider/findit+adj.+todo认为/觉得……怎么样常用动词不定式作宾语的动词有：hope,refuse,learn,wantchoose,decide,agree,plan,try…Theteachertoldmetocleantheblackboard.Iexpectyoutogivemesomehelp.在表示感官、致使等意义的动词后用不带to的不定式作宾补。(3).宾补二看watchsee三使letmake一听listentohear四注意:feelwarn,tell,allow,help,ask,want等notice五感觉:haveImadehimdohiswork.Hewasmadetodohiswork(byme).提示板:若变成被动语态,在上述结构中,不定式符号to要加上。(4).定语（修饰前面的名词）Ihavesomethingtosay.Thereisnothingtoworryabout.一些名词后常用不定式作定语，如：chance(机会），way(方法），time(时间）或者something等；另外，thefirst,thelast,theonly等作名词，它们后，也常用不定式作定语。a.目的状语:放在go,come,use,live,inorder,soas等词后面.如：Icometoseeyou．Herunsfastinordertogetthereintime．(5)状语b.原因状语:放在sorry,glad,surprised,disappointed,excited等表情感类的词后面。如：Iamgladtoseeyouhere．c.作结果状语。如:Theroomislargeenoughtohold1000people．•(6)不定式与疑问词who,which,when,how,what等连用，在句中起名词作用，可充当主语、宾语等。Hedidn’tknowwhattosay.他不知道说什么。(宾语)Howtosolvetheproblemisveryimportant.如何解决这个问题很重要。(主语)注意：•在与why连用时，用于whynot开头的简短疑问句中，后面紧跟的动词不定式不带to。Whynothavearest?•(7).固定句式中动词不定式的用法••常见的有：•hadbetter(not)dosth.最好（不）做某事Wouldyouliketodosth.?你想要做某事吗？Wouldyouplease(not)dosth.?请你（不要）做某事好吗？too+adv/adj+todosth太……而不能……•一、选择适当答案。•1._______isdifficulttoworkoutthemaths•problem.•A.ThisB.ThatC.ItD.Its•2.Wedecided_______attheendofthismonth.•A.travelB.notstartoutC.toleaveD.going•3.Theyhavenopaper_______.A.towriteB.towritewithC.writeonD.towriteon•4.Lethim_______arest.Ithinkhemustbetiredafterthelongwalk.••A.hasB.haveC.tohave•5._______thecomputerisaproblem.•A.HowtouseB.Whattouse•C.WheretouseD.Whichtouse•6.Theteachertoldus_______inbed.•A.don’treadB.readnot•C.tonotreadD.nottoread•7.Theoldmanwas_______angry_______say•aword.•A.so,thatB.as,asC.too,toD.very,to•8.Why_______hometomorrow?•A.notgoB.notgoingC.nottogoD.didn’tgo•9.TheTVsetistooloud.Willyouplease_______?A.turndownitB.turnitdownC.toturnitdown•10.It’scoldoutside.Youhadbetter____•___yourcoat.•A.toputonBputtingonC.putsonD.puton•二、用所给动词的正确形式填空。•1.Ittookhalfanhour_______(get)tothe•WorldParkfromKitty’sschool.•2.Itwasinteresting_______(see)somany•placesofinterestfromallovertheworld.•3.Theywant_______(save)timebyusingshorterwordsandphrases.•4.Kitty’sclassmateDanieltaughthimselfhow____(make)ahomepage.•5.Hemadethegirl_______(cry)yesterday.•6.Helphim_______(put)thephotosinthe•correctorder.•7.It’stimeforclass.Pleasestop_______(talk).•8.I’dlike_______(go)totheTempleofHeaven.