I'm quite confuse with the auxiliaries "Can, Could, May, and others you can named it". I will list a few examples.
Could you do me a favor?
Can you do me a favor?
May I go back home early today?
Can I go back home early today?
Could I go back home early today?
Could we use your pool?
Can we use your pool?
May we use your pool?
I was told that "may" is used when asking for permission, however a lot of situations also seems like asking for permissions as well.
Can anyone clarify for me? Emm.. perhaps could anyone clarify for me?