This parameter considers the categorical status of auxiliaries (Aux) with respect to lexical verbs.

Types:

AuxNotV: The language does not have auxiliary verbs.

AuxVInfl: Auxiliary verbs are verbs, and the inflection of lexical and auxiliary verbs is the same.

AuxNotVInfl: Auxiliaries are verbs, but the inflection of auxiliaries is not identical to that of lexical verbs.

Aux=VNoInfl: Auxiliaries are verbs, and neither auxiliaries nor lexical verbs are inflected.