Have you ever considered the relationship between what we say and what we actually want to say? It's quite acceptable that sometimes we don't want to show our real intention while we are talking to someone because of the fact that we don't want to be mean to the ones whom we talk to. I don't want you to think that it's a communication breakdown between those people who talk to each other indirectly. If they share the same mother tongue, they have a good understanding of that language's social environment, so sooner or later they're going to understand their inner voice. The thing is that as we are learning a foreign language it may not possible for us to know our target language's social environment if we don't live there where our target language is the mother tongue. Because of this issue, communicating with people with whom we don't share the same mother tongue can be challenging for us. We cannot limit it under the communication headline. Moreover, watching a foreign tv show or translating something from the target language to our native language or vice versa can also be challenging since we don't know much about daily expressions, sociolinguistic environment, and idiomatic expressions of the target language. To overcome it, we ought to be better if we try to learn about its culture. Let's consider our own language. We have the same level of daily expressions, idioms, phrases, collocations, etc. in our language. Furthermore, we don't use the same level of language with everyone and on every occasion. We arrange our language in terms of our tone of voice (formal-informal), word choices, dialects. They're all about sociolinguistics. Language is alive and it lives differently in different environments. It prevents us to become a robot while we are talking and makes communication more meaningful.