Say vs. Tell
Say and tell have the same meaning (decir), but they are used differently. You say something or tell someone something. In other words, tell is directly followed by the person you are talking to (I told Betty goodbye) whereas say is not (I said goodbye; I said goodbye to Mary).
In addition, there are certain expressions that are always used with tell: tell jokes, tell the truth, tell a lie. There are also expressions that are always used with say: say prayers, say mass, say grace.
Instructions. Fill the blanks with the appropriate form of say or tell.