Everything you know your 'subconscious' knows. The whole dream is your subconscious talking to you - every dream character, everything the dream characters say, every street corner, every ridiculous situation. It communicates through the full-spectrum of feeling, and in fact if you tried to just get some words out of it - you wouldn't get even a fraction of the full message.

Language is entirely symbolism, man. Everything you've ever known is an 'agreed upon symbol'. You can't take anything you see in a dream at face value, because it is all language, it's all various shades of word, with you at the center of it all. Maybe instead of trying to teach your subconscious self, you should learn the language that you've forgotten how to speak?