 How do you know if your tongues are real? Simple. If you speak in tongues and no one including yourself doesn't understand they're wrong. Paul says I don't want you to be ignorant and he said so speaking of something that comes out of our mouth and he wants us to pray or to speak with understanding. If you're edifying only yourself then that's incorrect. All spiritual gifts are given for the edification, the building up of others not yourself. If also your tongues aren't an actual language. Tongues are a language. That's what the word means. And lastly if your tongues aren't for an unbeliever in other words if they're for yourself or just to say something amongst a bunch of other Christians then those are incorrect. So when you speak in tongues and you cover the basis then you're fine otherwise you don't speak in tongues.