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1、动词不定式（theinfinitive）即todo，其否定形式是nottodo；不定式没有人称和数的变化。动词不定式:一.不定式的句法功能1.It’snormaltocrywhenwefeelsad.(做主语)不定式做主语时,常用代词it来代替不定式结构,这时it被称为形式主语,而作为句子真正主语的不定式则被后置.往往放v.和adj.之后.e.g.TolearnEnglishwellisnoteasy.=It’snoteasytolearnEnglishwell.It’s+adj.(+forsb.)+todosth.1.不定式做主语：常用句型：It’s+
2、adj.(+forsb.)+todosth.（对某人来说）做某事是怎样的形式主语真正主语=Toworkouttheproblemisdifficultforme.It’sdifficultformetoworkouttheproblem.=Workingouttheproblemisdifficultforme.e.g.对我来说解答出这道题是很难的。2.ThebestwaytolearnEnglishistoreadloudly.(做表语)可与be动词构成系表结构.HerwishistostudyinJiYanMiddleschool.Myjobisto
3、cleanthestreets.在形式上，位于系动词后的就是表语。从含义上讲，表语是回答主语“是什么”的语法成分。2.不定式做表语：常放在be动词后，表明主语“是什么”。e.g.Ourplanistogotherebyplane.我们的计划是乘飞机去那儿。（主语和表语指代的是同一事物）1.Myjobis_________computers.tosellingB.sellC.tosell2.Herhobbyis______(play)football.toplay=Herhobbyisplayingfootball.3.Iwanttobuyaticket.
4、(做宾语)接动词不定式作宾语常见的几个动词是want,plan,hope,decide,begin,start.need,wait,wouldlike.hate.refuse.wish.prefer,learn.try.like.agree,fail.beabletodo,do/tryone’sbesttodo等.e.g.Theydecidedtotryagain.Thelittleboywantedtogettoschoolbefore8o’clock.3.不定式做宾语：即动词+todo的结构中，这里的todo就是做宾语1.Myfriendswant_
5、_______(book)someticketstothemovieforus.2.Myparentsdecide_____(give)memoremoney.3.Heplans_____(go)toBeijingforaholiday.4.Theboyhopes______(pass)theEnglishexam.5.Mylittlesonisable_____(read)somewords.6.I’lltrymybest_____(help)you.7.Shewouldlike_____(become)beautiful.4.Kangkanghelp
6、edustolearnEnglish.动词不定式作宾语补足语,常见的动词有tell,ask,get,want,wouldlike,wish,teach,help,order,invite,get,allow,send,lead等.常构成下面的句式：V+sb.+todo其否定形式为：V+sb.not+todo(做宾语补足语)Shetoldmenottogivethebooktohim.IaskedPaultocarrythebox.4.不定式做宾语补足语：即动词+sb.+todo的结构中，这里的todo就是做宾语补足语1.Don’taskJim___(go
7、)swimmingwithus,becausehismotherwon’tallowhim____(do)so.2.Doesyoumotherwishyou____adoctor?A.beingB.tobeC.become3.Myteacheralwaystellsme____(study)hard.4.Idon’twantyou____(help)me.5.She’dlikeme____(join)them.6.Iwishyou____(have)agoodtime.Mybestfriendsteachme____(swim).8.Herfriendo
8、fteninvitesher____(have)dinner.9.Mymothe
