• May is more polite and formal than could, and could is more polite and formal than can.
• We don't usually use modals to talk about past permission. We can use was/were allowed to.
✓ We were allowed to buy one comic each.
• However, we do use could to talk about past permission in reported speech. (see Unit 25 for more information)
✓ Mum said we could buy one comic each.
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