( could ) is something that we use for future and past tense both , then please tell me what would be the form of verb we should use with past and future while using (could)?
'Could' is used in a number of ways:
1.To talk about ability. For example;
I could dance when I was younger.
2.To tell something was possible. For example:
My mother could act in those days.
3.To make a polite request. For example:
Could I carry the luggage for you.
'Could' expresses possibility and therefore it can be used to express past, present or future. Let us look at a few examples:
i) Present: Could you pass me the book? (a polite request)
ii) Past: I could not come to your place yesterday.
iii) Future: I could call you tomorrow. (possibility)