These types of strategies, by themselves, should not be considered undesirable or domineering. They are present in the conversational speech of most people and they are part of what makes conversation work. We recognize these subtle indicators as ways of organizing our turns and negotiating the intricate business of social interaction via language. In fact, one of the most noticeable features of conversational discourse is that it is generally very "co-operative." This observation has been formulated as a principle of conversation