Chosethebestsentencetoexpress”帮我一个忙”A.Givemeahand.B.Doyo
ugivemeahand?C.Canyougivemeahand?D.Couldyougivem
eahand?(D).D选项中含情态动词could表达说话人非常委婉的说话语气。GrammarModal
verbs(情态动词)主讲：谢兆锋情态动词的定义：情态动词表示话人对某一动作或状态的态度，认为“可能”、“应当”、“必要”等
等。Shemaybeaforeigner(可能---表推测)Youshouldapologizetoher(
应当—表建议)情态动词本身词义不完全，不能单独作谓语，必须和不带to的不定式（即动词原形）连用。情态动词没有人称和数的变化。H
ewillcometohelpme./Theywillcometohelpme.情态动词can
couldmaymightshallshouldmustwillwouldough
ttohavetodare(daren’t)need(needn’t)usedto能力can建议
should推测canmaymust许可cancouldmaymight过去习惯wouldused
tocan/could1.能，会（表能力，ability）Eg,Icanspeakseverallanguag
es./Canyoudriveacar?2.可以（表允许permission）could语气更委婉Eg,canI
comein?---yes,youcan,No,youmustn’tCouldyoudomeafavour?
-----表请求语气（request）3.可能（表猜测，guessing）can在肯定句中用的较少，多用于否定及问句中Anyb
odycanmakemistakes(人无完人)Canthenewsbetrue?—yes,itcan(×)co
uld(√)may/might/mustNo,itcan’tCan的特殊用法表“越、、、越好，再、、、也不过分”Can
not/never…too/enough,▲区别can与beabletoCan(could)指本能、天生的能力Eg,I
canspeak,IcanplayBeableto侧重经过自身艰苦努力，最后成功了，相当于managetod
o或succeedindoing,而且它还有多种时态的变化Thebabywillbeabletowalkin
afewweeks（C—E）她从很小的时候就能用英语和我们交谈了→Shehasbeenabletotalkto
usinEnglishsinceshewasyoung.﹍﹍﹍﹍高考链接Inthecoalminedi
saster,mostoftheworkerswerekilled,butJohn﹍﹍haveanarro
wescape.A.could,B.would,C.wasableto,D.canCAfter2
years’hardtraining,he____walkbyhimself.(could;wasable
to)﹏﹏﹏may/might1,可以（表允许permission)—might语气更委婉（can/could）Ma
y/MightIwatchTVaftersupper?---yes,youmay/No,youmustn’t
2,可能（表猜测guessing）--不用在问句中，但可用mightTheymay/mighthavemissedthe
bus3,表祝愿（要部分倒装）Youmaysucceed(你也许会成功)---Mayyousucceed!(祝你成
功)Mayyou(be)happyeverydayHaveatryIt’sraining,we____a
swellstayathome,watchingTV.A.Will,B.can,C.shall,D.
mayD注意：这里是一个有关may/might的固定用法，may/mightaswell+V原形，译为“还是、、、为
好，倒不如、、、”再如：Thereisnothingtodo,soImayaswellgotobed.
没什么事可做，我还是上床睡觉好了。Must的用法1，（主观）必须、应该（表义务，尤指法律条文的规定及条款）According
totheChineseConstitution,wemustlookafterourparentswhen
theybecomeold.---MustIfinishmyhomeworknow?---yes,youm
ust./No,youneedn’t/don’thaveto,不用No,youmustn’t2,想必，一定（表推测
guessing）语气最强---Canthisbehispen?Yes,itmust.Itmay/mig
htbe,butIamnotsureNo,itcan’t,hemusthaveleftitsomew
hereelse.Haveto(客观)必须、不得不（多种时态）Ihadtowalkhome,forImiss
edthelastbus.Must/haveto比较练习Thenoticesays”Books___be
returnedintime”Thetrafficlightwasred,soI____stopmycar
,althoughIwasinahurry.A.must,B.mustn’t,C.could,D.ha
dtomustDdare&need1.dare作情态动词时，主要用于疑问句、否定句和条 件从句中，一般
不用于肯定句。2.need表示“需要”或“必须”，作情态动词用时，仅用于否定句或疑问句中。在肯定句中一
般用must，haveto,oughtto或should.3.dare和need常用作实义动
词，有时态、人称和数的变化。所不同的是，作实义动词时，在肯定句中，dare后接带to的不定式，在否
定和疑问句中，dare后可接带to或不带to的不定式。HowdareyousayI’munfair!
Hedaren’tspeakEnglishbeforesuchacrowd,darehe?Youneen
''tcomesoearly.--NeedIfinishtheworktoday?--Yes,you
must.Heneedstofinishitthisevening.Iwonderedifhedar
ed(to)saythat.Don''tyoudare(to)touchit!Hedoesnotdare
(to)answer.Idaretoswimacrossthisriver.shall&shouldsh
all用于第一人称，表示征求对方意愿。shall用于第一、第三人称疑问句中，表示说话人在征求对方的意见
或向对方请求。shall用于第二、第三人称，表示说话人给对方的命令、警告、允诺或威胁。4.s
hould表示劝告、建议、命令。同义词是oughtto。在疑问句中常用should代替oughtto。Wh
atshallwedothisevening?Whenshallhebeabletoleavetheh
ospital?Shallwebeginourlesson?Heshallbepunished.(威胁)He
shallhavethebookwhenIfinishreading.（允诺）Youshallfailif
youdon’tworkharder.(警告)ShouldIopenthewindow?Youshould
gotoclassrightaway.will&would表示请求、建议等，would比will委婉、客气。
表示意志、愿望和决心。would可表示过去反复发生的动作或某种倾向。 would表示过去习惯时，比usedto正式
，且没有“现在已经没有此习惯”的含义。4.表示估计或猜想。Wouldyoupassmethebook?The
yaskedusifwewoulddothatagain.Iwillneverdothatagain.
Duringthevacationhewouldvisitmeeveryweek.Thewoundwoul
dnotheal.Ithoughthewouldhavetoldyouallaboutit.Whatw
ouldshebedoingthere?Itwouldbeabouttenwhenhelefthome.
判断正误:Howdareyousaysuchathing?Howdare
youtosaysuchathing?Hedaren’ttospeakEnglishbeforesuch
acrowd,didhe?Hedaren’tspeakEnglishbeforesuchac
rowd,darehe?Nobodyneedtobeafraidofcatchingthedisease.
Nobodyneedbeafraidofcatchingthedisease.Thesedishesneed
becleanedcarefully.Thesedishesneedtobecleanedcarefully
.Thesedishesneedcleaningcarefully.链接高考:1.Ithoughtyou_
____likesomethingtoread,soIhavebroughtyousomebooks
.A.mayB.mightC.wouldD.must2.Whe
reismypen?I____it.A.mightloseB.would
havelostC.shouldhavelostD.musthavelost3.Idi
dn’thearthephone.I___asleepA.mustbe
B.musthavebeenC.shouldbeD.should
havebeenBDB4.Thefirespreadthroughthehotelveryqui
cklybuteveryone______getout.A.hadto
B.wouldC.could
D.wasableto5.Theywill______runthismachineontheirown
inthreemonths.A.canB.couldC.mayD.beabl
eto6.Thatbigcinema______seat2,000people.A.canB.sh
ouldC.oughttoD.isabletoDDA7.Thereissomeone
knockingatthedoor.???????itbeTom??A.can? B.mu
st?C.should?D.oughtto8.--MayIpickaflowerinthegarden?--________.A.No,youneedn’tB.Not,please.C.No,youmustn’tD.No,youwon’tACsummary表建议：Shall/should表能力Can/could/beableto表推测Can/may/must/should表许可、请求Can/could/may/might/will/would即可作情态动词又可作实义动词Need/darehomeworkReviewwhatwelearnedinthisperiodExI----IIIonpage6/7inthehomeworkbook |
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