第1个回答 2013-07-30
“Be+不定式动词”在不同情况下,可以表示很多种不同的语义。下面便是其中九种:⒈表示坚决的命令。例如:1.Thisnaughtyboyistostayhereuntiltheclassisover.2.Nooneistoenterthisbuildingwithoutthepermissionofthesecurityguard.⒉表示“计划”或“安排的事项”。例如:3.Bettyistobemarriedsoon.4.Aninsuranceagentistomeetusthisafternoon.⒊表示“可能性”。例如:5.Areyoutopaythedebtforyourwife?6.Thelovelypuppyisnowheretobefound.⒋表示“意图”或“打算”。例如:7.Ifyouaretobethereontime,youhadbetterhurry.8.Ifallofusaretoremainfriendly,wemustbesincerewithoneanother.⒌表示“应该”。例如:9.Youhavedonesowell.Youaretoberewarded.10.Suchnastyquestionsaretobeavoided.⒍表示“不可避免”。例如:11.Annewaswonderingwhatwastobecomeofherboyfriend,Tommy.12.Themurdererwassentencedtolifeimprisonmentandwasnevertoseehisfamilyagain.⒎表示“假设”。例如:13.IfIweretodoit,Iwoulddoitwell.14.Evenifyouweretotakeataxinow,youwouldnotbeabletoarriveatyourdestinatonontime.⒏有“期待将来”的含意。例如:15.Theactualusefulnessofthenewlyinventedequipmentisstilltobedetermined.16.Henry'sappointmentwiththeaccountancyfirmisyettobeconfirmed.⒐有“必然会发生”的含意。例如:17.Shedidnotthinktoomuchofherunkindacts.However,theyweretobeharmfultoherself,too.18.Tomwasn'tworriedabouthisheadinjury,butitwastobetroublesomeforhimlater.上述九种“Be+不定式动词”的语义,稍纵即逝,常常会不多留意,而且也不会时常用到它们,但是只要定睛注意,多少也会领略这些结构的个中味。