Why is there a lot of people can learn many languages? How's learn
Well, first of all some people are just good at it, for some it is just quite easy to learn languages as it is for others to do math problems.
Second it probably depends on which languages you are learning, if the languages are similiar to your mother tongue, maybe from the same language family, it is easier and faster to learn them.
And third the technique I think. Some people have just found the perfect way for them to learn a language.