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
11-dehydrocorticosterone
affinity of dyestuff
antiimplantation
assembly-to-assembly failure propagation
Baptist Federation of Canada
be laying
Bishop's Stortford
bubble over with enthusiasm
cabinet set
cafeteria tray
capillary dipression
cascades frog
catogenic metamorphism
cercospora oryzae
close to traffic
coistrel
Collision Caused by Mixed Faults
color-video amplifier
commentations
common differences
compound triple meter
compounded essential oil
compressibility of a powder
convective precipitations
Cotes de Provence
crosscurricular
cuproenzymes
dedicated file server
dermasurgeons
dihydrotachysterol
Diplococcus fluorescens foetidus
directorate general of telecommunication (dgt)
dissettlements
dynamic simultaneous equations models
entamoebiasis histolytica
entrance taper
equality of fuzzy set
exclusible
extrinsical
Extropianism
fathers and sons
fibroma ematodes cysticum
field of application
follicular tumor
Germiool
googlers
group entomology
half in the bag
HE-double-L
Hedo-misaki
homoeroticisms
HWLWR
I/O area
ihhalatorium
J/psi particle
japanization
Knyagininskiy Rayon
kocharian
labette
liebfrauenkirche
master-class
McInnes
mediumblue
mend matters
mill extrusion
million operations per second
mudgut
multiple frequency vibration
navigational satellite receivers
news anchor
nidal
Niprazine
not do
Nuqayy, Jab.
octomitus hominis
operator prompting
our face
outlawry
perfectability
ph-lf
poristic polygon
pre-kest
pseudogobius javanicus
pyrolytic material
rackmounts
rule invocation
salesfloor
seasonal employment
self-fluxed iron ore
Shek Pik
slipway platform
Spiraea uratensis
stable node
state coordinates
stationary ergodic noise
structural constant
thermal expansion measurement
throbby
Todrazoline
tylosins
utilization of the three wastes
what for?