I learned the answer to that one in elementary school. Public school, at that! We were introduced to an old document, known affectionately as The Bill of Rights. I didn't understand all of it at the time, but that freedom of speech part was pretty clear.
Mrs. (or Mr.) Whatshername would be proud of you. And I am NOT being sarcastic here. (I’m starting work as an elementary school teacher in about two weeks, in fact.)
Now for the trick question: how do you feel about the Second Amendment?