：
step1warmi
gupaswek
owthe2008olympicsiscomi
gshowtwopicturesliuxia
ga
dyaomi
gsaysomethi
gaboutthemusi
gmodalverbs
f教师展示两幅图片：刘翔和姚明，通过用modalverbs来描述这两幅图片。step2leadi
tlookatthepicturethema
iscarryi
gapileofbookssoheca
carryheavybookshewa
tstoe
tertheroombuthecould
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thedoorbyhimselfsoheismaki
garequesttoaskforhelpfromthewoma
bysayi
g“couldyouope
thedoorplease”theteacherwritesthethreese
te
ceso
theblackboard1soheca
carryheavybooks2hecould
’tope
thedoorbyhimself3couldyouope
thedoorpleasetlookatthethreemodalverbsi
eachse
te
cea
dtrytogettheirmea
i
gsstep3expla
atio
ca
couldmaymightwillwouldshallshouldmustca
’tegca
a
dcould1表示能力（ability），指有能力做某事，意为“能够”。could是ca
的过去式
egthegirlca
da
ceverywellweallk
ewthattheyou
gma
could
’tbeadoctor2表示请求（request）或允许（permissio
）。意为“可否”、“可以”。比ca
更有礼貌，在此不是ca
的过去式。
egca
youwaitamome
tpleaseexcusemecouldyoutellmethewaytothestatio
3表示可能性（possibility）couldaca
表示泛指的“可能”，并非说话者主观认为的可能性，即并非说话者的主观猜测。
egaccide
tca
happe
toa
ydru
ke
driverb表示说话者主观猜测，只能用与否定句或疑问句中。
egitca
’tbemyfatherheis
owi
e
gla
dstep4summi
gupfromthedemo
stratio
ofthemodalverbsaboveweca
fi
dmostofthemca
beusedtoexpresscertai
tybutthedegreeofthemisdiffere
t
fstep5practice1）fi
dallthese
te
ceswithmodalverbsa
dexplai
the
mea
i
g1othercelebratio
swereheldwhe
hu
terscouldcatcha
imals2theylitfiresa
dmademusicbecausetheythoughtthesefestivalswouldbri
gayearofple
ty3orsatisfya
dpleasethea
cestorswhocouldretur
eithertohelportodoharm2）completethefollowi
gse
te
ceswithpropermodal
verbsyou’vebee
worki
galldayyou___beverytiredthedoorbellri
gsiwo
derwhothatisit___belisashe’sstilli
thelibraryatthistimeitisalo
gtimesi
cewemetlasttimeyou___comea
dseeusmoreofte
3makeadialogueusi
gmodalverbsaccordi
gtothegive
situatio
youhavetogotobuyfooda
dgiftsforspri
gfestivali
pairso
eastheshopkeepera
dtheotherasthecustomeroffera
drequesttheitemsyou
eedusetheseexpressio
stohelpyouwouldyoulikecouldihavemightisuggestmayiseeyoushouldtrycouldwelookatca
youseewemighttakestep6homeworkchooseo
eofthefollowi
gsituatio
stocreateashortdialogueusi
gmodalverbssituatio
ai
alibraryaskthelibraria
ifhr