English is the most useful language for the future.

I think people shouldn't rely on one english. Because no matter how difficult your language may be, you should know it and hope for popular ones such as English. Unfortunately, not many people know this because of this, in our country there are very few patriots. Secondlyif the whole planet will speak English then the country can easily manipulate the entire all people in the world. Also if something changes in English, such as pronunciation or grammar, it will be difficult to affect other countries. For example Kazakhstan switched to Latin so people very hard to understand. And finally reason which I should mention is that official language English have Britain and America because of this reason always will be misunderstanding.