The rule as a picture, 5 multiple-choice questions, 3 sentences to correct and a short writing task. Free to print and copy for your class or for self-study.
Want the explanation first? Read the Can vs Could lesson
Can is for ability now and casual requests: I can swim. Can you help me? Could is for general ability in the past, polite requests and possibility: I could swim at five. Could you help me? It could rain.
I can speak Spanish.
I could speak Spanish as a child.
Write two sentences about your own life: one with Can and one with Could. Then explain the difference to a partner.
Answers will vary. Check that each sentence follows the rule on page 1, or paste them into Clarigram to have them checked.