Knowing what someone says does not always equal knowing what someone means. It may be as silly as whether to use soda or coke. Much of your decision is learned from your context. Do you invite someone for a soda? If so, it may mean you will offer a variety of flavored carbonated beverages. Do you invite someone for a coke? If so, it may mean you will offer only a Coke-a-Cola. Context matters when it comes to communication.