English is the most powerful and necessary laguage at the moment worldwide. You’d want to learn it so you can literally use it anywhere in the world. Majority of the country in the wolrd teaches essential English so it will help anyone who is wanting to travel. Even for myself when I first arrived in France, some people knew how to speak English so it helped me in many ways. As for Japanese, I can teach essential and intermediate classes. The way of using grammar, writing, basic kanjis, speaking and listening etc.