Cannot Vs Could Not. In this case it is correct to say That cant be Obama at the door its too early. While Cant Have Been is used to refer to an incident in the near past Couldnt Have Been is used for an event that happened way back in the past.
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I am unable to swim here is exactly same as the. Even if I were starving I could not eat tripe. The word can in its most common form means to be able to do something.
Cannot and Cant Both cannot and cant mean that a person or object does not have the ability to do something.
I am not able to eat tripe because it makes me ill. However you wouldnt necessarily use them in the same contexts. Refers to a impossibility in the past. Jenny can not only read she can also write.
