‘Can’ and ‘could’ are modal verbs which can be used in a few different ways.
Use “can” to talk about:
I can swim well.
When mum gets back from shopping we can go out.
I am not working today so we can go to the beach.
You can park here.
Use “could” to talk about:
Possibility in the past:
Last year, we could go on holiday wherever we wanted.
Uncertain possibility in the future:
She could fail her exam unless she studies more.
Use either “can” or “could” to ASK permission. “Could” is more polite and formal:
Can I have another cup of coffee?
Could I borrow your car?
However, to GIVE permission, use “can” or “cannot”.
You can go out now.
You can’t borrow my car.
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