大年初一的劳动成果----情态动词（2）6、shall的用法⑴用于二三人称的陈述句，表示：命令、警告、威胁、强制、允许或决心等意思eg.YoushalldoasItoldyou.Tellhimthatheshallhavethebookbacktomrrow.Youshallnotleavethepost.No,sheshan’tgo.Theyshallsucceed.(决心)⑵用于二三人称疑问句中，表示征求对方意见或请求许可eg.ShallIgowithhim?Whatshallwedonext?Shallhecomeinorwaitoutside?7、should的用法⑴表示对现在或将来的劝告、建议，用should+Veg.Youshouldkeepyourpromise.Weshouldgoandmeetherattheairport.Weshoulduniteeveryonethatwecan.⑵表示对过去的愿望或看法，用shouldhavedoneeg.Youshouldcomefiveminutesearlier.Heshouldn’thavemadesuchmistakes.（本不该）⑶用在与将来事实相反的虚拟条件句中eg.IfIshouldcomelate,pleasedon’twaitforme.Shouldyoumeethim,youwouldgiveittohim.8、oughtto的用法：意思与should相同，只是语气稍微强一些eg.Weoughttohelpeachotherinourwork.Yououghtnottowritesocarelessly.Oughtn’twetogivehimachancetotry?Yououghtn’ttohavetoldhimwhathadhappened.（本不该）Sheoughttohavekeptitasecret.（本应该）9、will的用法⑴表示意志、意愿eg.Wewillhelpyouifyouaskus(to).Iwilltakeyouthereifyouwill.⑵用于第二人称作主语的疑问句中，表示征询意见或提出请求eg.Willyoucometomorrow?Whatwillyoudowithouthisemailaddress?⑶表示习惯性、必然性的动作，有“就会”“总是”“惯于”“毕竟”等意思eg.Fishwilldieoutofwater.Hewilltalkforhoursifheisgivenachance.Boyswillbeboys.男孩子毕竟是男孩子。10、would的用法⑴作为will的过去式eg.Thetsaidtheywouldhelpus.(过去的意愿)Hewouldsitlikethatforhours.(过去的一贯动作)⑵用于第二人称作主语的一般现在时的疑问句中，表示语气委婉eg.WouldyoupleaselendmeyourMP3?Wouldyoulike(tohave)somecoffee?Wouldyoumindmyopeningthedoor?⑶可以用来表示推测，假设（虚拟语气）eg.Suchwouldbeourhomeinthefuture.(用于总结性的语句中)Thatwouldbeinthespringof1960.Whatwouldyousaytohimifheshouldcome?11、need的用法⑴无时态、人称的变化，主要用于疑问和否定句中，没有人称和数的变化eg.Needwebuyanynewequipment?Yes,youmust./No,youneedn’t.That’sallsettled.Itneedn’tbetalkedabout.Youneedn’thavecomelastnight.（本不必来实际来了）*Youdidn’tneedtocomelastnight.（本不必来实际也没来）⑵need也有实义动词的词性，后接不定式或名词、代词，用于各种时态eg.Doesheneentoknowit?Youdon’tneedtodoityourself.Weneedtounitewiththem.12、dare的用法：⑴作为情态动词主要用于疑问句、否定句和条件句，没有人称和数的变化eg.Dareyougohomealone?Shedarenotsaywhatshethinks.Iwon’tallowyoutoswimacrosstheriverifyoudaredoit.Thecurrentistooswift.⑵dare用于实义动词，可以接不定式用