时间:2019-02-01 作者:英语课 分类:英文语法词汇


英语课
特征
1)情态动词(modal verb)本身有词义,表示说话人的语气或情态,但词义不完全,不能单独用作谓语动词,一般只能和动词原形一起构成谓语动词。
2)情态动词所表示的情态有:命令、允诺、请求、拒绝、愿望、愿意、义务、必要、可能、能力、敢于、需要等。
3)情态动词(ought除外)和助动词shall,will,should,would一样,后面的动词不定式一般皆不带。
形式变化
1)没有人称和数的变化,第三人称单数的现在时也无变化。如:
I can We can
You can You can
He
They can
She can
It 
2)有些情态动词有过去式,有少数过去式和它的原形相同。
a)有过去式的情态动词有:
may —— would
can ―― could
may―― night
shall —— should
have to —— had to
b)过去式不变的情态动词有:
must — must (或had to)
ought to — ought to
need———need
dare — dare(亦可用dared)
3)大多数情态动词后面可用动词的进行式、完成式和被动形式,如:can(may,must)be doing,can(may,must) have done,can(may,must)be done等。
否定式
情态动词和助动词一样,后面可直接跟否定词not。现将情态动词的否定式及其否定式的简略式(简略式用于口语中)列举如下:
shall not——shan't [FB:nt]
will not———won't [wEunt]
can not—can't [kB:nt]
must not—mustn't [5mQsnt]
should not—— shouldn't
would not—— wouldn't
could not—— couldn't
dare not— daren't [dZEnt]
need not—— needn't

在疑问句中的用法
情态动词在疑问句中的用法和助动词相同。如:
May I ask you a question? 我可以问你一个问题吗?
Can you let me use your dictionary for a minute? 你能把字典借我用一会儿吗?
Would you like to visit the heavy machinery plant? 你想参观重型机器厂吗?
注意have to在疑问句中的位置。如:
Do you have to go out today? 你今天一定得出去吗?
Does he have to finish the work tomorrow? 他明天非做完这项工作不可吗?


学英语单词
adelites
age of stand
amplitude modulation VTF
anglepedestal
angletwitch
antipedobaptists
area denial
Baladang
Bandwidth-on-demand
baryta yellow
brine compartment
calf-length
catch the fancy of someone
Cippenham
clearing away heart-fire
cloth-bound
coefficient of growth
cyst of hymen
d-deoxyephedrine
desk checking
Desmodium laxiflorum
digital electronic control
direct digital marketing
discriminancy
diversity statements
double depth plow
edward youngs
electric protable drill
enriched condition
evasorious
extrudates
flange back
flexuoso-
fundamental theorem
Geisslor tube
goes to the toilet
Grand Travers Bay
guiding device
hanigan
herba artemisiae
herods
herpes ophthalmicus
humeroulnar head
iefs
immunotubes
imperializes
implied term
influence mine
instructional medium
intender
interim supplement
Jehovah's-Witness
kamotoite- (y)
key way pull broach
kutern
laryngeal syncope
legal realism intellectual mood
lexical analyser
lichen tropicus
lomes
Lycopus coreanus
mine run coal
misutilization
mutual agency
Nayoro-gawa
non-metallic cable
pappier
payndemain
Pericallis hybrida
photo injected current
poidometer
primitive equation model
Pterostyrax
pyr(r)hic succession
read me
relief committee
scatter bombing
selection of firing position
shielded magnet
sirott
sleaze-bucket
snowpacked
spreadly
sprucing up
SR (starting reliability)
stilledly
suborder Lemuroidea
subscapular artery
supermastergroups
sviridenko
tapered section
the remission of sins
tipula (yamatotipula) nova
transfer vehicle
two-wire-wide strands
unit cell
unsympathizer
up to the hilt
vertical temperature
vollenhoven
wide-band cable television
Woltersum