You must eat healthy food - Important or necessary, You mustn't touch the fire - You're not allowed, I have to study every day - It is a requirement, You don't have to bring food - It is not necessary, We had to go to school - it was necessary in the past, I didn't have to cook last night - it was not necessary in the past, When I was 6, I could jump the rope - Ability in the past, She couldn't play guitar when she was 7 - Ability in the past (negative),

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