H. studies epistemic verbs in contrastive focus, by means of which you can enter the communicative level of discourse when you want to question the ongoing communication in one of the dimensions of comprehensibility, truth, sincerity, or correctness (cf. J.Habermas 1971: 'Vorbereitende Bemerkungen zu einer Theorie der kommunikativen Kompetenz'), H.P. Grice (1975: 'Logic and conversation').