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1.MorphologyInAmericanEnglish,anumberofirregularverbshavebecomeregularised,whileremainingirregularinBritishEnglish:a)Inmanyinstances,itisonlythevoicingofthepasttensemorpheme-(e)dwhichhasbeenchangedtoregularisetheverb:BritishEnglishAmericanEnglishPresentPastorPastorPastParticiplePastParticipleburnburntburneddwelldweltdwelledlearnlearntlearnedsmellsmeltsmelledspellspeltspelledspillspiltspilledspoilspoiltspoiledb)InsomeirregularBritishEnglishverbs,thereisavowelchangefrom/i/inthepresentto/e/inthepastparticipleforms.TheAmericanEnglishformsretainthepresenttensevowelinthefollowingcases,aswellasvoicingtheending.BritishEnglishAmericanEnglishPresentPastorPastorPastParticiplePastParticipledreamdreamt/dremt/dreamed/drimd/kneelknelt/nelt/kneeled/ni:ld/leanleant/lent/leaned/li:nd/leapleapt/lept/leaped/li:pt/c)ThepastparticiplegottenisnotusedinBritishEnglish.InAmericanEnglish,itwasformerlyrestrictedtobeingusedinthesenseofobtainoracquire:I'vegottenanewcarsinceIlastsawyou.Now,however,gottencanbeusedinallmeaningsexceptforhaveinAmericanEnglish:Wehavegottenhomelateagain.Theyhavegottenmeintotroubleagain.Wehadalreadygottenoffthetrainwhenitwashit.Ihavegotplentytoeat.Ihavegottheideanow.(understand)2.DerivationalTwoverb-formingaffixeswhicharesomewhatmoreproductiveInAmericanEnglishthanBritishEnglishare:-ify:citify,humidify,uglify-ize:burglarize,decimalize,hospitalize,rubberize,slenderizeb)Anotherwayofformingnewwordsisbysimplychangingaword’sgrammaticalclass.Again,thereismoreofatendencytoformnewwordsinthiswayinAmericanEnglishthaninBritishEnglish,e.g:NounVerbanauthortoauthorahosttohostaskyrockettosky-rocketpressuretopressure(B.E.topressurize)aroomtoroom(Iroomatthehouse.)3.Auxiliariesa)mustThenegativeofepistemicmustiscan'tinSouthernBritishEnglish(Inthenorth-westofEngland,mustn'tisusedratherEthancan't):Hemustbein---hisTVison.Hecan'tbein---hiscarisgone.InAmericanEnglish,themostcommonnegativeofepistemicmustismustnot.Notethat,unlikenorth-westBritishEnglish,InAmericanEnglishthiscan’tbecontractedtomustn’twithoutchangingthemeaningoftheauxiliarytonotbeallowed:Hemustnotbein---hiscarisgone.(epistemic)Youmustn'tbeinwhenwearrive.(notallowed)However,mustn'tcanbeepistemicinthepastperfect:Hemustn'thavebeenin.(Eveninsuchcases,theuncontractedformispreferredinAmericanEnglish.)b)usedto:Inquestioningornegatingsentenceswiththemodalusedto,BritishEnglishcantreatusedtoeitherasanauxiliary,inwhichcaseitinvertsinquestionsandreceivesnegation,orasalexicalverbrequiringdofortheseconstructions:Heusedtogothere.(auxiliary)Usedhetogothere?(lexicalverb)Didheusetogothere?(auxiliary)Hedidn'tusetogothere.(lexicalverb)InAmericanEnglish,usedtoistreatedonlyasalexicalverbintheseconstructions,andthisisalsobecomingincreasinglythecaseinBritishEnglish.ContextDo-substitutionDeletionBritishonlybothAmericanandBritish.Didhepasshisexam?Yes,hediddo.Yes,hedid.Haveyoucleanedtheroom?Yes,Ihavedone.Yes,Ihave.Ihaven'treadthisyet.ButIwilldo.ButIwill.Ihaven'tboughtone.ButImaydo.ButImayCouldn'tyoudothatlater?Yes,wecoulddo.Yes,wecould.4.VerbPhrases1)InBritishEnglish,thecopularverbsseem,act,lookandsoundcanbefolloweddirectlybyanindefinitenounphrase.InAmericanEnglish,theseverbsmustbefollowedfirstbytheprepositionlike;seemcanalsobefollowedbytheinfinitivetobe:BritishAmerican/BritishItseemedalongtime.Itseemedlikealongtime.Heseemsanintelligentman.Heseemstobeanintelligentman.Johnactedarealfool.Johnactedlikearealfool.BritishAmerican/BritishThatsoundsabadThatsoundslikeabadidea.idea.ThathouselooksaThathouselookslikeaniceone.niceone.2)like”British/AmericanAmericanWe'dlikeyoutodothisnow.We'dlikeforyoutodothisnow.3)TheverbwantcanbefolloweddirectlybytheadverbsinandoutinAmericanEnglish.InBritishEnglish,wantmustbefollowedfirstbyaninfinitive:BritishAmericanIwantedtocomein.Iwantedtobeletin.Iwantedin.Thedogwantstogoout.Thedogwantsout.AlsowantcanbeusedinthesenseofneedinBritishEnglishwithaninanimatesubject:Thehousewantspainting.ThisisnotpossibleinAmericanEnglish.4)TheverbdecidecanbeusedasacausativeverbinBritishEnglish:Non-Causative:Hedecidedtogobecauseofthat.Causative:Thatdecidedhimtogo.InAmericanEnglish,decidecan'tbeusedasacausative;instead,aperiphrasticphrasemustbeused,suchas:Thatmadehimdecidetogo.“Buy”and“sell”inAmericanEnglishmeanrespectively“accept”and“causesb.toaccept”:Hewouldnotbuythatidea.Heistryingtosellusonlinguistics.Doubt作为动词用在肯定句中后面通常接whether或if，而在否定句中则接that,这是英国英语的用法。在美国一般用that.Idoubtthat...Aim后面跟at是英国用法，如：Heaimedatbecomingascientist.而在美国则用aimto，如：Heaimedtobecomeadoctor.Raise一词在英国17、18世纪可作“grow”,“breed”,“rear”解释，后在英国此用法被淘汰，而在美国此词仍然保持原来三种意义，如：InEngland,onegrowfarmorgardenproducts,breedanimals,andrearschildren.InAmerica,oneraisesthemall.Mainstream:Originallyitmeansaprevailingcurrentordirectionofactionorinfluence.NowinAmericanEnglish,itmeans“toputthestudentsofmixedabilityinoneclass.”Someeducatorswarnthatmarkedlyhandicappedchildrencanprofitmorefromsegregatedorindividualeducationthanfrombeingmainstreamedintoclassroomswithotheryoungsters.Loan:Thesearethebooksloanedtochildrenforhomeuse.(AmericanEnglish)Swing:tofol