could, I was able to swim as a child., mustn't, Swimming is not permitted here. , can, I am able to swim, should, We advise you to supervise your children swimming., Do you think I we will be able to swim?, Yes, swimming is allowed., Would it be ok to swim at night?, Requests to swim at night are considered., Could you teach me to swim?, Swimming lessons are available., I might like to swim if it is hot., It is a possibility in the future., I could swim 5 miles. , I think it is possible. , I can swim 5 miles., It is a certainty., I may swim 5 miles., It is uncertain..

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