1 are actually 2. While they are, perhaps, 3 to meaning in communication in the same way as grammar or vocabulary, they may, nevertheless, convey 4 in some way. Let me give you some examples. The first is 5, which indicates the need for 6. The second is 7. This is to show 8. The third is 9, which is to show 10. The fourth is 11. This, um, is to indicate 12. The last is extra lip rounding, which expresses greater 13, especially with babies, for example. So we can see that there are a number of ways of altering our tone of voice and when we do this consciously, we do it to create different effects in communication.