Among many other aspects of discourse structure G. discusses the relationship between speaker and hearer, modality, cohesion, topicalization, etc. There is also a brief overview of discourse study so far. G. claims that theoretical models of language worked out at the level of the sentence and below can be successfully expanded to account for larger structures without becoming unrecognizable. Field work linguists can carry out meaningful studies on discourse structure as well as they can on any other part of language.