欢迎来到天天文库
浏览记录
ID:19081910
大小:548.00 KB
页数:37页
时间:2018-09-28
《英语语法(05动词b)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、UnitFive:Auxiliary,Infinitive,Participle(II)Issuesofthisunit:1)Auxiliaryverbs助动词2)Verbinfinitives动词不定式3)Participlesof-edand-ing分词英语中一共有3个基本助动词:do,have,be和13个情态动词(modalverbs)(Page281)。do作助动词:加在否定词前构成否定句(donot)可以加在主动词前表示强调Dobehonest!Idowantit!have作助动词:主要协助构成完成体等hav
2、edonebe作助动词:主要协助构成进行体、被动态等bedoingbedone1)Auxiliaryverbs助动词这里我们关注的是情态动词,它们分别表示能力、可能、必然、义务、许可、意愿、决心等。Mostlikely,youarealreadyexpertsonwhattheymean.Forinstance:IbelieveIcanfly./Youcanusemycar.Weoughttoabidebythetrafficrules.Itmusthaverained,‘causethegroundiswet.Thet
3、ruthwillout.所以,接下来我们看看一些需要注意的问题。1.canandbeableto:由于can没有多少形态变化,所以表示能力时一般表示现在的能力,而过去和将来的能力一般用beableto(时态的区别)。could虽然也可指过去的能力,但一般不指具体能力。IcanspeakEnglish=I’mabletospeakEnglish.CAFUCstudentswillbeabletowintheCCTVCUP.Thegeniuscould(wasableto)writeatage4.But:Schumacher
4、wasabletodrivetheracingcarwhenhewasachild.还有:can可以表示机会、条件等,ableto则不能。Everychildcandreamofbecomingthepresident.Shecangotouniversitynotbecauseshestudieswell,butbecauseshedanceswell.注1:在否定句中,cannot=notbeableto;couldn’t=was(were)notableto;could即可指一般能力,也可表示具体能力.Wecoul
5、dn’t(weren’tableto)reachthesummitofthemountainbecauseofthestorm.注2:can表示“许可”时不能用beableto替换;如:Youcanalwaysusemytypewriter.Youarealwaysabletousemytypewriter.×3.那么need的否定是什么?作动词:--DothestudentsneedtosubmittheirtermpaperbeforeFriday?--Notnecessarily/No,theydon’tneedt
6、o.作助动词:Youneedn’tmaketwocopies.Onewilldo.Needwecometomorrow?而maynot的含义为“也许不”,例如:Ishereallyright?Hemaynotberight.4.Dare的用法:1)dare用作实义动词,此时其后的动词不定式可带to也可不带to。Idaretojumpdownfromthetopofthewall.Shedoesn'tdare(to)meetherteacher'seyes.2)dare用作情态动词,主要用于疑问句、否定句和条件句中。Ho
7、wdareshedothingslikethattome?Dareyoucatchthemouse?---Idaren'tdothat.5.情态动词+不定式进行或完成体,表示推测或可能性:Theymay(might)beleavingtomorrowmorning.Hemayhavemissedthetrain.Youcouldn'thavemetsisterMary.Shediedbeforeyouwereborn.It’ssolate,andhecan’tbestillworking.Sincetheditchisf
8、ullofwater,itmusthaverainedlastnight.表示与设想相反的事态:Sheshouldhaveletmeknowitsooner.Imighthavehelpedhersome.Ihaveneverexpectedthatthepickpocketshouldhavereturnedmyp
此文档下载收益归作者所有