You can classify any language into an underlying tongue, even the languages you are versed with. People don't understand how it is that people can pick up on tongues and a whole language just by the Spirit, not realizing that that's how all languages began. The early man spoke and immediately knew what he was saying and those listening to him were able to interpret and respond. It is a spiritual impartation that God gave to man that few touch upon. Consider Gods communication with Adam. From the beginning, Adam could hear and understand God fully without ever needing to learn Gods language. Likewise with Eve, they communicated effortlessly. Language and communication are spiritually and come from the Spirit. Today, language is learnt and not imparted into people, that's why they dont see it as spiritual manifestation, yet they all were given by the Spirit initially.. Tongues is you learning the origins of spiritual communication, where you can learn a whole language in a moment and can interpret even if you've never heard someone language before if it differs from your own. It is a spiritual exchange. I recommend to you to receive the baptism of the Holy Spirit and learn a language by the Spirit for spiritual things