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
abash
alkali metal soap
annular beam control modulator
antihaemolysin
Araboid
astraught
at the helm of a state
axial plane of fold
barium hypochlorite
be junior to
bethel
Betula pendula
Block-multiplexor channel.
Bratsche
break it
breakin function
Bride, saint
Brittas B.
brow-beatings
burnish broaching
by my faith
calls at
Carpenter syndrome
cautionings
CAV
ceiling lamp seat
ceratium carriense volans
coal hatchway
colonizes
curved shapes
Dasyaceae
deck-cargo barge
delirium posttraumaticum
delta loss
discharge regulater
distribute in
drop sharly
ectoentad
execution control function
external packaging
fillet interference
flanneries
gabbros
gas thermometry
goldhammer
ground-slag
growth-need
hears out
hertzgaard
home fried potatoes
household enterprises
intelligent verification
intermediate roller
karyotypic abnormality
liquid detector
loading current
maati
make a monopoly of some commodity
make no bones about
Microdictyon
mid mounted tool
modifier spark advance
nalcs
natrix sipedons
novismuth
Nyavka
overlapping part
pangborn
Paraphlomis
perfossion
piston type spray pump
Rabdosia medilungensis
relieving tool holder
resource resolution table
restruction
rotary chorea
scamming
seed dressing?
sensible combustion period
sentais
serion
shaken in his shoes
simeonova
sorbonitrile
spheroidal coordinates
square-metre
straight conveyer
Tellyesniczky's mixture
term of a series
the green channel
Theme-song
tocogram detector
Touho
trimethylene acetal
trochars
understrokes
upper brake shaft bearing
Vorob'yëvskiy Rayon
widespreader
xerocopies
young-eyed