warpus
Sommerswerd asked me to change this
English speakers generally get by in most of the world so everyone should learn English just for the opportunities that presents.
Other languages don't matter so much from a practical standpoint. You do learn a lot about English grammar when you learn another language, though. Native English students usually never learn about their conjugation or infinitives or anything like that unless they study another language.
For purely practical reasons, yes, you can get by with just English. However, you learn things by learning other languages that have nothing to do with the language. You see the world through different eyes.
I feel like seeing the world through the eyes of someone who only speaks only 1 language is just not enough. There is a lot more that the world has to offer and you will only see it by learning other languages and becoming fluent in them.
I feel that this should be something every human should go through, lest they spend their entire lives with misconceptions of the world they live in and an inability to see it from a different point of view.