时间:2018-12-18 作者:英语课 分类:英文语法词汇


英语课

   我们现在学过的情态动词有:can, could, will, would, may, must, should, shall。


  情态动词后动词总是用原形。(不受其他任何条件影响)
  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 1 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?

1 machinery
n.(总称)机械,机器;机构
  • Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗?
  • Machinery ought to be well maintained all the time.机器应该随时注意维护。
标签: 英语语法
学英语单词
ablet
acanthopanax goraldii harms
airlane
Angle's classifieation
apatheism
Arroyito
ascosporulation
automatic teller machines
Barayy
becure
birational isomorphism
bisphenol a type epoxy resin oleate
bolting machine
bouvard
brushy
cogentin
contact holding indicator
delphinium kawayuehii tamuse delphinium leptpogin hand.-mazz.
diagonal frame
dixylic
drive sb. to the wall
erlembald
ethic of conviction
ethoxy pentane
exhaust flame-damper
fixed stop robot
flavin
fundamental skill
gene-splicing
generated involute
genital spike
george orson welless
grid shielding can
gruner
gymowe
Haematopinus tuberculatum
Hegelism
hirundo rustica gutturalis
hypophosphatemic
ifsoever
import-exports
instruction pulse
insulating mould coating
isospin invariance
Kaufmann's method
Ladder Option
loan value ratio
loop sensor
M1020
machine manager
maffick
mcparlan
meimuna gakokizana
membrana obturans stapedis
MFAC
Mladomir
modulation formats
Mount Emu Plains
moutan
Movietone
muffler tail pipe support clip
multi level control system
multifamilies
multilateralists
nonflame
oil sampling valve
Oshuko
Palos
parallel displacement of curve
perigeal
phantasmatas
photophony
polygonum sachalinense fr.schm
portable examining table
premalting
presteady state
proceeds of installment sales
pulse repetition (or recurrence) rate
Puriton
quenching of coke
rasterisations
research survey
salignac
sarcophaga nigribasicosta
satin walnut
shift identify method
soft-paste porcelain
sputum coctum
ST_fear-and-danger_taking-risks
stable amplitude
taken after
total mortality coefficient
typoese
underwings
uninterred
Union Of International Conventions
unweaves
upeneus subvittatus
white film
whorefuckers
Y-joint
Zierke