Martin (2013: 107):
[2] To be clear, the obvious speech function equivalent of K2 is a demand for information, a question, and the obvious speech function equivalent of A1f is a giving of information, a statement.
looking at a given stratum from above means treating it as the expression of some content
For statements and questions there is a clear pattern of congruence: typically, a statement is realised as declarative and a question as interrogative – but at the same time in both instances there are alternative realisations. For offers and commands the picture is even less determinate. A command is usually cited, in grammatical examples, as imperative, but it is just as likely to be a modulated interrogative or declarative, as in Will you be quiet?, You must keep quiet!; while for offers there is no distinct mood category at all, just a special interrogative form shall I ...?, shall we ...?, which again is simply one possible realisation among many.













