Within this overall conversational pattern, a range of other governing principles has been observed, such as strategies for getting and holding the (conversational) floor at adequate transition relevance places (TRPs), following the appropriate sequencing of verbal actions in various kinds of adjacency pairs (such as question/answer pairs, pairs of greetings, etc.), as well as the proper insertion of opening and closing sequences which indicate that and where conversations start and end.
Other conversational devices that occur throughout most interactive discourse are repairs and re-starts, through which conversationalists respond to actual or potential upcoming difficulties, pausing, as well as a range of linguistic expressions that serve as hedges (i.e. mitigating the strength of an utterance, by using modal auxiliaries, for example) or politeness expressions rather than carrying proper information