Obligation and permission in the past

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What is the past form of this sentence: We mustn't take our jackets off.

We couldn't/weren't allowed to take our jackets off.

What is the past form of this sentence: I can't wear jeans at school.

I couldn't/wasn't allowed to wear jeans at school.

What is the past form of this sentence: We must leave early

We had to leave early

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