can aur could ka use bhi bta dijiye please

Could is the past tense of can. It is used to talk about ability that existed in the past. In my younger days I could run four miles at a stretch. Till last year I could read without glasses. Note that could doesn’t always refer to past time. It refers to past time only when the context makes the time clear.

Can use for present capacity and permission. I can jump 6 feet. Can I have your pen please. Could use for past capacity and politely permission. I could dance when i was in school. Could you please give me those key.