Grammar:ModalverbsUnit1情態(tài)動詞有一定的意義無人稱和數的變化通常不帶to表示說話人的語氣或情緒語法特征1.Ability(能力):LiuXiangcanrunthe110mhurdleracewithin13seconds.can/could:1.can一般表示與生俱來的能力或者一種客觀可能性,還可以表示請求和允許。LearningEnglish_____bedifficult.canMancannotlivewithoutair.

_______Iuseyourbike?Cancan/could:2.在疑問句中，用could可表示請求，語氣較委婉。—____Ihavethetelevisionon?—Yes,you_____./No,you_____CouldHeasksifhe____smokehere.couldcan/maycan’t/I’mafraidnotcan/could:3.表示驚異、懷疑、不相信的態(tài)度。（主要用在否定句、疑問句或驚嘆句中）

He’ssuchanicepersonthathe______committhecrime.

can’t你怎么會如此地粗心！

Howcanyoubesocareless!

Canthisbetrue?

can/could:4.cannever/can’t……too表示“無論怎樣…也不過分”，“越…越好”。你過馬路的時候再小心也不為過。

Youcan’tbetoocarefulwhilecrossingtheroad.

can/beableto區(qū)別:Edisonalwayswonderedwhyhenscouldhatch(孵)chickenswhilehewasnotableto.Question:Arethetwomodalverbsinterchangeable(互換)?Ifnot,why?can表示與生俱來的能力或一種客觀可能，而beableto更加強調通過后天的學習和努力獲得的能力，或者在某個客觀的場合和背景下，能做到的事情。Sumup1.can和beableto1)can(could)表示能力、可能,只用于現在時和過去時。2)beableto可以用于各種時態(tài)。只用beableto的情況：

a.位于助動詞后。

b.情態(tài)動詞后。

c.表示過去成功地做了某事時,只能用was/wereableto,不能用could。can/beableto區(qū)別:AbigfirebrokeoutinABChotelyesterday.Luckily,everyone__________runoutofthebuilding.wasableto2.She_____speakbothEnglishandFrench.can1.Theywill______runthismachineontheirowninthreemonths.A.canB.couldC.may D.beableto2.Thatbigcinema______seat2,000people.A.canB.shouldC.oughttoD.isabletoDA3.(2007福建)MyMP4playerisn’tinmybag.Where___Ihaveputit?A.canB.mustC.shouldD.wouldA4.Aleft-luggageofficeisaplacewhere

bags____beleftforashorttime,especiallyatarailwaystation.A.should

B.canC.mustD.willB5.How___yousaythatyoureallyunderstandthewholestoryifyouhavecoveredonlypartofthearticle?A.canB.mustC.needD.mayA6.Mike___beapoliceman,forheismuchtooshort.A.needn’tB.can’tC.shouldD.mayB7.—Iheardtheywentskiinginthemountainslastwinter.—It____truebecausetherewaslittlesnowthere.A.maynotbeB.won’tbeC.couldn’tbeD.mustn’tbeCI’msotired!Ihavetodothetrainingforatleast10hoursaday!2.Obligation(義務):…yethemust

workhardtowinthegoldmedal.AlthoughLiuXiangissogiftedinhurdlerace…oughtto/shouldhavetomustYourmotherbringsyouupandtakesgoodcareofyou,sowhensheisold,you___lookafterherinreturn.

A.canB.mayC.havetoD.must

ShiDongpengmightwinamedalattheOlympicGames.Althoughthechanceofwinningamedalissmall,I’lltrymybest!3.Certainty(可能性):must表示肯定的猜測，譯為“一定”，不能用于否定句或疑問句。Thismustbeyourpen.Hemustbedoinghishomeworknow.Hemusthavearrivedalready.must2.表示“堅持”（常用于固定句型：ifyoumustdosth.如果你非得要做某事）如果你真的要走，那就悄悄離開。Ifyoumustleave,doitquietly.4.Permission(允許):May

IeatKFCifIwinthegoldmedal?may/might:1.表示許可。表示請求、允許時，might比may的語氣更委婉一些?！狹ight/MayIuseyour

computer?—Yes,youcan./No,youcan’t/mustn’t.may/might:2.用于祈使句中表示祝愿。3.表示推測、可能（只用于肯定句，疑問句則要用can或could）。

祝你成功！

Mayyousucceed.

Hemaybeverybusynow.

Mayyoubehappyallyourlife.

2)成語:may/mightaswell,后面接不帶to的不定式，意為"不妨"。e.g.Ifthatisthecase,wemayaswell try.5.Makingrequests(提出要求):Can

youhelpmewithmytraining?Idon’tknowhowtousethisequipment!willcancouldwouldinformalformal6.Makingsuggestions(提出建議):Shallwedothetraininginthemorning?It’stoohottotakeexerciseintheafternoon.shall:1.Shall用于第一、第三人稱疑問句中，表示說話人征求對方的意見、向對方請示或提供幫助。1.Shallwebeginourlesson?2.Whenshallhebeallowedtoleavehospital?

3.ShallIcarrythisbagforyou?shall:2.Shall用于第二、第三人稱，表示說話人給對方命令、警告、允諾或威脅。

Youshallfailifyoudon‘tworkharder.

Heshallbepunishedaccordingtotherule.

等我讀完這本書，就會給他的。HeshallhavethebookwhenIfinishit.警告威脅允諾7.Makingoffers(提供幫助):Don’tworry,dear,Iwillwashthemrightaway.Mom,mydirtyclotheshavebeenpiledup!Idon’thavetime……will/would:1.表示請求、建議等，would比will委婉客氣。sentencepattern

Wouldyouplease…Wouldyoumind…Wouldrather…Wouldyoulike…will/would:2.表示意志、愿望和決心。

Iwillneverdothatagain.

3.可表示經常性、習慣性、傾向性。翻譯為“經常、慣于、總是”。1).Theoldman_____haveasmokeunderabigtreeeveryafternoonafterhefinishedhisfarmwork.

would8.Givingadvice(提出意見):Youshouldnot/oughtnottoeatsomuchbeforerunning.Howdelicious!!!should:1.Should表示勸告、建議、命令，其同義詞是oughtto；在疑問句中，通常用should代替ought…to。ShouldIopenthewindow?

我們應當要相互學習。

Weshouldlearnfromeachother.oughttohavedonesth.\shouldhavedonesth.本應該做某事,而事實上并沒有做;否定句表示“不該做某事而做了”。Yououghtto(should)havebeenmorecarefulinthisexperiment.Heoughtnottohavethrowntheoldclothesaway.(事實上已扔了。)注:oughtto在語氣上比should要強。should:2.情態(tài)動詞should用于第一