Because English is the language of the world, of all countries. Used to communicate with each other, no matter what language is used, each national language.
Because English is the language of all countries of the world. The communication between Whether an individual is using language as the national language. When you interact with people of different languages and cultures, all people need to use English as the primary anyway.
Because English as a lingua franca world of all countries. The communication between each other. No matter what language is the national language, each use.