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