In Diu Indo-Portuguese, the copula selected for class-inclusion is described as an individual-level copula (as opposed to a stage-level copula, reserved for less time-stable predication). There is both a non-Past form (ɛ) and a Past form (ɛr) of the individual-level copula.
Source: Cardoso 2009: 154
Source: Cardoso 2004-2008