Everyone learned to speak by listening to their parents speak. Then they learned many more words by just talking.
However, when you study a foreign language, you mainly learn how to read and write first. Why is that?
It is because it is difficult for an instructor to talk individually to all students in a class at a group lesson setting. This is the limitation of group lessons.
On the other hand, study abroad is said to be effective in the learning of the language. It is because listening to the local language on a daily basis, the opportunity to speak increases. That is important in the learning of the language is, to listen as much as possible of the words, and, I, such that repeated to speak to think