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Anonymous Posted 12 years ago
Grammar

could

Why is "could" (used in a positive sense) not used to express an ability to do something on one particular occasion.
  

Top answer

I assume you're refering to past events. For example, you could say I was able to swim back to the boat. ) In example like the one above , you should use "was able" instead of "could".

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1 Answers
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I assume you're refering to past events. For example, you could say

I was able to swim back to the boat. (I could swim back to the boat.)

In example like the one above , you should use "was able" instead of "could".

As for the reason why you can't use 'could', I suppose it's because 'could' is normally used for both past and present events/situations , so to