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could vs can



 
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ESL Forum | English Vocabulary, Grammar and Idioms
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could vs can #1 (permalink) Tue May 10, 2011 10:06 am   could vs can
 

When we hear the doorbell, we say,"That could be Tom." Why doesn't "That can be Tom" work?

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could vs can #2 (permalink) Tue May 10, 2011 18:47 pm   could vs can
 

Because you aren't sure who is at the door. Don't forget that 'could' is less definite.

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