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Learning a language is in some way, like learning how to fly or play the piano. There are important differences, but there is a very important similarity. It is this: learning how to do such things needs lots of practice. It is never simply to "know" something. You must be able to "do" things with what you know. For example, it is not enough simply to read a book on how to fly an airplane. A book can give you lots of information about how to fly, but if only read a book and then try to fly without a great deal of practice first, you will crash and kill yourself.