Here's why:
* English is a system of communication: It includes sounds, words, grammar, and meaning. It's not just about the physical act of speaking.
* The brain is involved: Our brains are responsible for processing language, generating thoughts, and forming words.
* The mouth is a tool: It's the instrument we use to physically create the sounds of English.
So, while the mouth plays a vital role in speaking English, it's not the sole source of the language.