Tenses in English - Future or Present Continuous?

http://www.engvid.com/ "I am going to go home." or "I am going home."? What is the difference between the future "to be going to" and the present continuous? You MUST use a base verb in one of the tenses! Does this sound confusing? It's pretty simple, so watch this important grammar lesson to learn the answer. Then take the quiz here: http://www.engvid.com/tenses-in-english-future-or-present-continuous/