Modeling pragmatics assists your child in learning how to use words in communication for different purposes. It is helpful for you to demonstrate to your child components of social language and using correct language patterns to match a situation, like speaking differently in a classroom than on a playground. Another component includes following conversation rules as turn taking in conversation, rephrasing when misunderstood and staying on topic, according to the American Speech and Language Association.
Language development is acquiring certain speech patterns at various ages. As your child learns language mostly from you, it is typical for him to pick up cues in other environments and copy different language uses in a variety of situations.
Your child's skills to use language influences his ability to build friendships, and interact with adults and peers. If your child is not expressing or using speech as compared to his peers you may want to consult with a medical professional to determine language and pragmatic delays.