If you know a language, you can construct units of meaning which you have reason to believe your receiver will interpret in a specific way. You are aware that both you and the receiver share the same frame of reference, and are aware of the context within which the message is delivered. There is plenty of ambiguity in natural languages, and we have to consider contextual clues and other information for the communication to be successful. There is o lot of way to communicate and language is the one used most. To know a language means to read, to listen, to write, and to speak it. The key competence to use a language is speaking. In a different part of the World, people use different languages so they need to learn each other’s language to communicate. Today English is the most common and technological language. So whatever you do you have to learn and use it.