This is a cliche but languages are indeed tools for communication. Some are good at using it and others aren't. If you want to use it well, all you have to do is to know how to use it, and then you have to use it repeatedly until you are satisfied. I have a tool of Japanese and I believe I can use it well enough to make myself content. However that tool can't be used for other languages. Each language has its own shape. I luckily had an opportunity to take tools of English and Korean and I want to master them. I'll give it my best shot!