Study means we are not only given meaning from one word or sentence but we also understand what the sentence means. So we can understand what the other people say to us. Study English also not only know the grammar of the sentence but we also can make a sentence from grammar knowledge that we have.
From the statement before, we can conclude that study English is a process to understand English languange. By understanding the meaning of the word or sentence and we can apply that in our habbitual action based on the grammar and meaning. So other people can understand what we mean. And we understand what other people means.