根据短文理解，选择正确答案。

    We are all learning English, but how can we learn English well? A student can know a lot about English, but maybe(可能)he can't speak English.

    If you want to know how to swim, you must get into the river. And if you want to be a football player, you must play football. So, you see. You can learn English only by using it. You must listen to your teacher in class. You must read your lessons every day. You must speak English to your classmates and also you must write something sometimes. Then one day, you may find your English very good.