摘要: 用“can “could 来谈论可能性 我们使用 `can’ / `could’来谈论某事得可能性.但我们不用它们来谈论某事将会发生的机 会. e.g. 1) Fire can be dangerous if we are not careful. (It is possible for fire to cause danger if we are not careful.) 2) Mr. Sun could not get out because he hurt his leg. (It was not possible for Mr. Sun to get out because he hurt his leg.)

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