Hi Rayniery, Good question! It depends on what we want to use them for. May: May can be used for permission Example: May I go to the bathroom? It can also be used to talk about something in the future that is not certain. Example: It may rain later. You should bring your umbrella just in case. Might: Might can also be used to talk about the future. Example: I might go to the party tonight. Or I might go to the cinema. Could: Could is used for conditionals when we're talking about ability. Example: If I had more money, I could buy a new car! It's also used to make polite requests. Example: Could you open the window please? These are just some examples but I hope that makes it a little clearer :)