Other forms: maybes
When you say maybe, you're not completely sure about your answer. If you say you'll maybe study at the library tonight, it is possible that you'll go there.
Maybe is a shortened version of the Middle English phrase, "it may be." People use it when they're not sure about something — or they aren't ready to give their answer. Sometimes other things have to happen — or not happen — before you can be sure. For example, because it might rain tomorrow, you aren't sure there will be a baseball game. In the meantime, you answer, "Maybe," if someone asks if you are going to the game.