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标题: 问一个时态一致性的问题, 关于could。PREP1-Q28 [打印本页]

作者: venus2elva    时间: 2010-5-2 14:07
标题: 问一个时态一致性的问题, 关于could。PREP1-Q28
1P28

Polio, although it is eradicated in the United States, it continues elsewhere and is able to be brought into the country by visitors.

(A) Polio, although it is eradicated in the United States, it continues elsewhere and is able to be

(B) Polio, although eradicated in the United States, it still continues elsewhere and can be

(C) Although still continuing elsewhere, polio has been eradicated in the United States and could be

(D) Although having been eradicated in the United States, polio still continues elsewhere and is capable of being

(E) Although eradicated in the United States, polio continues elsewhere and could be

选E,唯一对E有异议的是时态,continues and could,could在这里为什么不用can?还是在这里特别表示一种弱语气的可能性。。。求指教。多谢。

作者: venus2elva    时间: 2010-5-4 10:36
顶一下。
作者: venus2elva    时间: 2010-5-5 13:11
UP
作者: baijuguoxi1020    时间: 2010-10-14 19:17
三、表示推测  (1) 对现在或将来的推测,两者均可用,但can 通常只用于否定句或疑问句中,一般不用于肯定句,而could则可用于肯定句、否定句和疑问句:
  It can’t be true. 那不可能是真的。
  What can they be doing? 他们会在干什么呢?
  We could go there this summer. 今年夏天我们可能要去那儿。(将来可能性)
  You could be right, but I don’t think you are. 你可能是对的,但我并不认为你是对的。(现在可能性)
  【注】can 有时也用于肯定句中表示推测,这主要见于:
   表示理论上的可能性(即从理论上看是可能的,但实际未必会发生):
  Even experienced teachers can make mistakes. 即使是有经验的教师也可能出错。
   用于含有only等表示限制的肯定句:(from www.yygrammar.com)
  “Who is that at the door? ” “It can only be the postman.”“门外是谁?”“只能是邮递员。”
   后接“be (get, seem, become)+形容词”,表示“有时会”、“时常会”等:
  It can get very hot here. 这里有时会很热。
  She can be very unpleasant. 她有时很令人讨厌。

表能力和表推测是不同的,could表能力时在肯定句中代表的是过去时态,但是表推测的话就不是过去时了。
could可以在一般现在时的句子中表推测,可能性。

我查到的,希望能帮到你
作者: mia113    时间: 2011-7-26 20:26
谢谢ls的解释·很清楚··
作者: Kya    时间: 2013-7-27 09:24
baijuguoxi1020 发表于 2010-10-14 19:17
三、表示推测  (1) 对现在或将来的推测,两者均可用,但can 通常只用于否定句或疑问句中,一般不用于肯定 ...

非常感谢~~~正好解惑




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