when we use (can) and when we use (could) in asking someone ???<br/><br/>ex : could you be my friend OR can you be my friend ???<br/><br/>thanks alot <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/2.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/2.gif' alt='Emotion: big smile'/>