What comes one time in today, three times in tomorrow and never in the future?

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I have a ring, but no hands. I used to be plugged into the wall but now I follow you everywhere. What am I?

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There is a dog on one side of a lake and a woman on the other. The woman calls the dog over and when he gets there he is not wet at all. How is this possible?

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A teacher has a class of 30 children but only 2 pupils. How is this possible?

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