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
a/d interface
acropodium
aerosol container
ailuro-
alizarin blue rbn
angle quote
Auktaung
Aust.
automatic-control stability
balancing charges insurance
be honoured as
black matrix
boulder and shingle foreshore
brissard
carnaubanol
cartilaginous tubes
cellar door lock
certhium nodulosum
chloral ammonia
CIMF
cis-Elizabethan
cold blood
convergence theorem
customeral risks
decision software package
dross tippler
econometric studies of consumer demand
eight-gem decoction
electricaldipole
eustachian tube insufflation
face log
fine measuring instrument
forced yawing test
give sth a jerk
Greenawalt type sintering machine
guidance counseling
herzenbergite
hiatuses
hide options
high milling
holocausts
ID (indicating device)
isles
kidpic
lecanuet
library-baseds
linear separable time
low grade reduction
Lukona
m. adductor pollicis
macroglossum neotroglodytus
main clock
management ideology
melodium
metagglutinin
moonshine in the water
nordell
overbank turbidite
oxidizable
phae
phenidine
Phyllophaga
pico-kelvin
plexus nervornm spinalium
prayer beads
radio frequency stability
red-tapisms
regrouped
removal efficiency
required information
saber shin
saw notch
semi-nude
semilunar bones
servosystem zeroing
settlable
sevenight
slack bilge
sobbers
soft air
sound deadening
splitting commission
strakes
submerged-root
superconducting critical magnetic field
tailing weir
thread death
triaenopogon barbatus
trielectrode arrangement
true sandalwoods
tuberculosis inoculata
urine albumin after exercise
vestibular pupillar reaction
VISSR
wax-flower
wedge grip gear
Western Asia
wire pliers
worm-gear
wyeued
zekogensis