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
amylmercuric iodide
anamirta cocculus
apparitionists
bank sloughing
banner exchange
be burned out
be itching for
birational morphism
boardsource
bordeaux arsenites
bostan
bourgeois consitution
Brandt's method
bye-lines
calinaga buddha formosana
car-following control
chief radio officer
climbing rope
club cells
collaborative agent
computed price
contemporary tracks
coupon sheet
cross country power
curmudgeonliest
dasyprocta agutis
de niroes
disheveled
emuwa
Excluded Commodity
family raphidiidaes
Fermi velocity
Fetisovo
frishberg
front-to-back effect
gallonis
Gelidiales
gree
hardening by isothermal heat treatment
has acquaintance with
Hodgen's method
immune to all plead
isothermal weight-change determination
Jüchen
left shunt
lights-out server room
linear programming file generator
load member
manure salts
mediaevalist
mikhaylov
mission data reduction
multiple film
ocidizer
oligoaerobic
option dealer
outoftone
ovarian myxoma
partitioned segmentation
peed-a-boo system
phase-advance network
philonotis falcate
Piasmodium falciparum quotidianum
piece wood
PK nail
pligs
pneumato-hydrothermal deposit
pointcloud
Poldnevitsa
polyhomeostatic
possible precipitation
purple-flowered
quadrilingual
resultado
rhythm guitar
rountree
Rumanian
Saenger's maculae
satellite relay station
second-order model
segment of the economy
service walkway
shar-peis
sharing criteria
shikai
slipperly
Sonnar lens
state fund
steel pointed marline spike
straw fiber
tacticians
theodolite drag
thereza
tobacco combine
toyle
transfer data
umina
uridyltransferase
wild-oat grader
woed
yassky
yearly load factor