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
add on security
adverbial number
alas and alack
Ananda Bazar Patrika
assubjugate
atherosperminine
baseball manager
bevelling frame
bituminous concrete mixture
broadnosed
butynes
call screening
camping sites
casting-machine
catch someone bending off guard
clear negative
Corydalis bungeana
cross turn
cross-river buoy
cultural inheritance
derived investigating level
differential protective relay
disvolution
early warning station
efficiency movement
elaborative
enumerated population
foreign exchange translation
ganglia inferius nervi glossopharyngei
gda
gesture in red
haarscheiben
halifaxes
hermaic
honey press
horizontal blowing engine
hot pressed mica
hot procedure
in-core inoization chamber
iron-manganese concretion
jennifer muller the works dance company
k-cars
kayoed
koudou
kryptocotyledons
L-AP4
lap-strakest
Larkhall
laryngeal prominences
legal procedure
legal-rational domination
leibman
like
longar palm
macfish
magneto-optic bubble display
mahoganyize
Nith, R.
nNOS
number of axial feeds
O6-alkylthymine
obnubilate
parliamental
perjured
permit to operate high speed craft
phenolic resin
pneumatic (conveying) dryer
Potentilla crenulata
prearranged visual signal
Preparis North Chan.
present distance
proficiency testing
program data independence
ragozin
rawnesses
rimose
rosat
Salix berberifolia
SEDEX
self actualization need
shahanshahs
spacer basket
spring-mounted engine
Stauntonia cavalerieana
straight connecting rod
strike horror into sb
supercompacton
synthetic resin hydraulic hose
tank-transport truck
thermoelectrical actinograph
tiff
ToAddress
tracklaying tractor
turbulent diffusivity
ulmus proceras
ulnar artery
uncle art
usnavy
vagus nerve nucleus
vanishing magnetism
variety degeneration
wongers