SHOULD / SHOULDN'T / COULD / COULDN'T / CAN / CAN'T

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John had a stomachache. He ____ do his homework.

John had a stomachache. He COULDN'T do his homework.

Mary ________ drive a car. She's very good at it.

Mary CAN drive a car. She's very good at it.

Harry _________ do his homework. He had a headache.

Harry COULDN'T do his homework. He had a headache.

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