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be+动词不定式（即be+todosth.）的用法如下：1.表示按计划或安排要做的事.例如：Whenareyoutoleaveforhome?你什么时候回家?Sheistobemarriednextmonth.她将于下个月结婚.TheQueenistovisitJapaninaweek’stime.女王将于一周后访问日本.这种结构也可用于过去.was/weretodosth.表示曾经计划要做的事,但不表明计划是否被执行,或表示“命运（即命中注定要发生的事）”,而非计划；was/weretohavedonesth.表示未曾实现的计划.例如：IfeltnervousbecauseIwassoontoleavehomeforthefirsttime.我感到很紧张,因为我很快就要首次离开家了.Theysaidgoodbye,littleknowingthattheywerenevertomeetagain.他们告了别,不知道以后再也不会见面了.Weweretohavetoldyou,butyouwerenotin.我们本来想告诉你的,但是你不在家.2.表示“应该”,相当于should,oughtto.例如：Youaretoreporttothepolice.你应该报警.Whatistobedone?应该怎么办呢?3.表示“必须”,相当于must,haveto.例如：Theletteristobehandedtohiminperson.这封信必须亲手交给他.YouaretodoyourhomeworkbeforeyouwatchTV.看电视之前你得先做完作业.4.表示“想,打算”,相当于intend,want.例如：Ifwearetobetherebeforeten,we’llhavetogonow.如果我们要在十点前到,我们现在就得走.5.用于第一人称疑问句,表示征求对方意见.例如：AmItogoonwiththework?要我继续完成这项工作吗?Whatarewetodonext?我们下一步该怎么办?6.用于否定句,表示“禁止”,相当于mustn’t.例如：Thebooksinthisroomarenottobetakenoutside.这个室内的书籍不得带出室外.Youarenottosmokeinthereading-room.你不可以在阅览室里吸烟.7.表示“可以,可能”,相当于may,can.例如：Thenewsistobefoundintheeveningpaper.这条消息可以在晚报上见到.Suchpeoplearetobefoundeverywhere.这种人到处都有.Sheisnowheretobefound.在哪里也找不着她.8.weretodosth.用于if或evenif/eventhough从句中,表示对未来的假设.例如：IfIweretotellyouthatIkilledhim,wouldyoubelieveme?要是我告诉你是我杀了他,你会相信吗?Evenifthesunweretoriseinthewest,Iwouldneverdosuchathing.即使太阳从西边出来,我也决不做这种事.9.betoblame(该受责备,对某坏事应负责任)与betolet(待出租)两种结构中,用不定式的主动形式表示被动含义.例如：Whichdriveristoblamefortheaccident?这事故是哪个司机的责任?Thishouseistolet.这房子要出租.Exercise1.Wehavebeenlookingfortheboyalltheafternoonbutheisnowhere_____.A.toseeB.seeingC.seenD.tobeseen2.Asearlyashissecondfilm,Chaplinhaddevelopedhisownmannerofacting,theonethat___worldfamous.A.wouldbecomeB.becameC.wastobecomeD.hadbecome3.----WejustsawJohnatthebookstore.----That’sstrange;Ididn’tthinkhe____backuntiltomorrow.A.willcomeB.wastocomeC.iscomingD.istocome4.Thefinalexamination___earlyJuly.A.istobeheldB.istobetakenplaceC.isgoingtoholdD.willbetotakeplace5.Ifthesun___tomorrow,whatwouldwedo?A.werenottoraiseB.doesnotriseC.wouldnotriseD.werenottorise6.Anewhospitalwasto____inthisdistrict,butthemoneywasn’tcollectedyet.A.havebeenbuiltB.bebuiltC.builtD.havebuilt7.Lookattheseclouds.____.A.It’sgoingtorainB.It’srainingC.ItistorainD.Itcanrain8.Whodoyouthink____forthefailureoftheirmarriage.A.toblameB.tobeblameC.istoblameD.istobeblamed9.Neitheryounorhe____tothefront.A.aretobesentB.istobesentC.havetobesentD.istosend10.I____tobedwhentherewasaknockatthedoor.A.wentB.amgoingtoC.wastogoD.wasabouttogo11.----____we____againnextweek?----Yes,let’smakeitnextWednesday.A.Are;tomeetB.Shall;betomeetC.Will;meetD.Are;meeting12.Asstudents,we____.A.won’tsmokeB.arenottosmokeC.aren’tsmokingD.don’tsmokeKey:1.D2.C3.B4.A5.D6.A7.A8.C9.B10.D11.A12.B作业帮用户2017-10-13