An individual may say words clearly and use long, complex sentences with correct grammar, but still have a communication problem – if he or she has not mastered the rules for social language known as pragmatics. Adults may also have difficulty with pragmatics, for example, as a result of a brain injury or stroke.
You have invited your friend over for dinner. Your child sees your friend reach for some cookies and says, “Better not take those, or you’ll get even bigger.” You’re embarrassed that your child could speak so rudely. However, you should consider that your child may not know how to use language appropriately in social situations and did not mean harm by the comment.