- May: to ask for or give permission(polite)
 
                   May I speak to you for a second?
                   Yes, you may use my laptop.
                   No, you may not use my laptop.
- Would: to ask somebody to do something
 
- Would you like:  to make an offer or invitation 
 
                   Would you like another chocolate?
                  Would you like to go out?
- Will: to ask somebody to do something 
 
                  Peter, will you come here for a minute?(very polite)
                  Would you carry my bags for me,please?