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
.ocx
afform
aggressive
alkalic rock
alleging
aluminum yellow brass
anthracosaurid
appropriation refund
argulus
armed forces medicine
astrakhanite (bloedite)
Ballsh
black spots
bomb-attack
bowling league
breakbacks
Bugaz
calender cut
capital ratio
channel coal
chemosensor
claviflora
cosmic absorption
crew factor
criminal statute
darell
Dover, Pt.
estimation program behavior
fairpoint
fencing hall
florentine iriss
free space wave
Gamboula
gloomier
Gm allotype
Gregory I, Saint
hallooing
hanwags
Hardinge countercurrent classifier
here-dring
heusner
Hochgern
hong kong sar
human-powered flight
IBDA
label data type
landing runway
leard
lip line
loose straw
Memecylon caeruleum
monetary history
Müllrose
Nemagraptus
New World porcupine
nickel cadmium cell
Nishiyama process
nonclimatological
nonexperiencing
nuons
O-acetylacrifoline
octantis
only to find
orifice support
paired-bond dissociation
pansy violet
paragraph assembly
pathogen transmission
peuceptyelus kanmonis
pre-positioned
precision very high frequency omnidirection range
primary grouping
recrawl
residue class degree
reverberant steady-state sound
rhinodon
root laboratory
rubella
Sam Wanamaker
scrambled eggs
scrutton
seed cotton dryer
self-correcting sample
signaling cascade
sneak
sodium fusion test
square neck
ST_disease-and-illness_respiratory-disorders
standardized installation categorization
take ... stand
tensioning device
terpenic
Tifosyl
transmission spark control valve
unevenness of illumination
vicia unijuga a.br.
Vila Pery
visceral mycosis of salmon
VS (virtual storage)
water bath development
water transmission pipe
Winisk