Use of 'Could (past form of can)' in English Grammar


1. Describes an ability that someone had in the past.
Ex : I could swim when I was young. / You could see the boat sinking.

2. Often used in auxiliary functions to express permission politely.
Ex : You could borrow my umbrella. / Could I get you more water?

3. Used to express possibility.
Ex : Could it be true? / is plan could really work out.

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