Perhaps when you were just beginning to learn English you wondered "why should we teach it?". English is the language spoken by almost the whole world. Wherever you come, it is English that will help you somehow understand a foreigner. Also, English is quite simple. There are not many rules in English. Learning any language is a great way to develop. Learning new words of an unrelated language, you can improve your speech, its expression. Also you can learn from what English words occurred those or other words in the Russian language! For example, jeans. Also, the English language - a beautiful language. It sounds very melodious and pleasant to talk on it. That's why we learn this language.
