[3][4][5][6][7][8][9] Since the publication of Lyons' work, a range of environments have been suggested from which (subjective) epistemic modals are assumed to be banned.
This corpus data further shows that there is no consistent class of objective epistemic modal verbs, neither in English, nor in German.
The table below illustrates in which environments the most frequent epistemic modals in German, kann `can', muss `must', dürfte `be.probable', mögen `may' are attested in corpora (yes), or yield ungrammatical judgements (no).
[13] Many linguists have considered possible links between epistemic modality and evidentiality, the grammatical marking of a speaker's evidence or information source.
Some work takes epistemic modality as a starting point and tries to explain evidentiality as a subtype.