When you want to ask permission to someone.

  1. May I
  2. Sorry
  3. Thank you


May is the most formal. May I was more polite. For example, May I come in? May I suggest we come back to this later if we have time?

The correct answer is: May I

    Courtesy is the use of polite manners. Most people would define courtesy as 'polite behavior that reflects good manners and respect and kindness to others. When you want to ask permission to someone, requests and when giving or refusing permission, we use may I when we want to sound more polite.