We use could to say that something was permitted in the past: Many years ago you could smoke in cinemas, but now it’s banned.
We also use was / were allowed in the past: We had to wear a tie at school, but we were allowed to take it off in hot weather
Refusing permission
We use couldn’t / wasn’t allowed to to say that something was not permitted in the past: We couldn’t cross the border without our passports.
Must not / mustn’t is also used for permission, but is more formal. It is often used on signs and in announcements: Passengers must not speak to the driver while the bus is in motion.
Asking about the past:
We use was allowed to? Could you? to ask if something was permitted in the past.
Were you allowed to stay up late when you were a child?*
Could you stay up late when you were a child?*
Could people travel between East and West Berlin during the Cold War?*
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