Form
Can / Could / May + I / we + Verb?
Can I borrow your charger?
Could we ask a question?
May I be excused?
Meanings
Asking For Permission
We use these modals to ask if it is okay to do something. The choice of modal depends on the level of formality.
Can I…? – Informal and very common. Use with friends and family.
Can I have some water?
Could I…? – More polite. Use in more formal situations or when you want to be extra respectful.
Could I use your computer for a moment?
May I…? – Very formal and polite. Use with people you don’t know, or in very professional or official situations.
May I see your passport, please?