Re: Would you or Could you - politeness Well the correct polite forms are:
Familly & close friends: Can I/you........, please? example: Can I have the car tomorrow, please?
Teachers, boss, someone you know but not friends with etc...: Could I/you......., please? example: Could I have next Tuesday off, please? But if you are asking a stranger for directions, you would say: Could you tell me the way to......., please?
To superiors, Grandparents, stranger etc..: May I...........? (no please, because this is the ultimate form of politeness) example: May I leave the room? May I be excused?
If you teach this way, there will be no confusions.
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