1.The people speak English in mostly countries.
2.You can find expensive job with english.
3.You can't meet with people's in USA, ENGLAND, GREAT BRITAIN, GERMANY, SWEDEN, CANADA without English.
4. You can ask for help or something on the outdoor with English.
5. You can traveling without problem, if you know any popular language, e.g English.
6. You can find good friend in other countries