I see countless of people using "can", "could", "will" and "would", simply using them, mixing them up and more. I am not sure and want to be clear of the meaning, usage and difference of these words.
These are a few examples:
Can and could
a) I can check your order and see how is the status. b) I could check your oder and see how is the status. a2) Can you give me a lift back home? b2) Could you give me a lift back home?
Will and would a) I will help you with your homework tomorrow. b) I would help you with your homework tomorrow. a2) Will you refund my money? b2) Would you refund my money?