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
-oriented
ACANTHOCEPHALLA
accounting for management
accupuncture
actuating variable
air force cryptographic code system
antioxidative
arsenobetaine
assuerus
audit capability
AUSDRUCKSTANZ
automatic background control
bacterial microscopy
balance test
balsamina
building daylighting
channelization
Chelilutine
chromosantonin
concentrated solution
coprostanols
Custer, George Armstrong
daughter of Mamus
demitrius
diphallia
displace in
dklr-limited sequence
elongation of wire
engine cleansing agent
equatorial plane
extramammary Paget disease
felt fungus
Ferula olivacea
flaking out
formfulness
fused-on
gadsdens
go to a lot of expense to do something
historicisation
Holy mackerel !
in small print
intertie
inverse transistor
isotelic substance
khatris
knee rafter
Kāmāreddi
leaf-organ
Lempav
Ligamentum radiocarpale dorsale
limit of drift ice
linctures
low-intensity storm
luggage and parcel traffic accident
Lysimachia foenum-graecum Hance
mandatory law
manufacturing automation protocol (map)
maturant
melanoacanthoma
mesotherms
minimum susceptance function
monocistronic messenger RNA
moving magnet fuel indicator
muskified
mycosphaerella fragariae (tulasne) lindau
outer liner
Pan-Cake
pentaiodozincate
Pinus californiarum
piptocephalis formosana
plentifulness
pokharis
positional control
pre-compaction
preuroporphyrinogen
pronephric tubules
Pukch'ang
quantum transition
rarachose
redwood scale
ricefish
Rimjob
Satna R.
schlumpiest
seamline
serial binary coded decimal
shade bearing tree
Shapshal'skiy Khrebet
sleeping-spaces
slop chests
spark counters
summarisation
Tamaulipas, Sa.de
tomorrowless
unit of pipe
up-path noise
uzbekistans
vacuum-assisted brake
valence shells
vascunicol
without scruple
xeronosus