Well I did this with a few people and all of them succeded, but not all of them talk to it constantly, as some are shy so yah XD but yah talking to your subconscious with only words, I didn't try to talk in my laungauche but English works well, just talking with words in your mind, no need for learning anything.

So yah I am not sure if it will work for everyone but you could try and give me feedback if you succeded =/

Basically what you have to do is sit somewhere preferably quiet, doesn't have to be voiceless but not loud and then relax a tiny bit so you are not focused on everything but no need to meditate XD and then say in your head with a tought "Can you hear me?" you should get a reply as a voice/whisper or just a tought "Invading" your head, at start you might get small headackes while you get the reply, but the reply can also be a image or a feeling or maybe a song stuck in your head for no reason, those are replies when it's shy, if it's not shy it will just talk normaly with words. And ofc when you get a reply, feel free to talk about whatever you want XD but whoever tries, I got only 1 question for your Sub-c, What's the color of their sky? XD (Whatever color it is it's ok, it can really be ANY color, mine has Turquose sky)

Uuhhh....sorry if I sounded confusing, I'm just a shy person XD, thanks for listening, looking foward to feedback ^^