In Diu Indo-Portuguese, imperfectivity is marked periphrastically, with an infinitive main verb preceded by the auxiliary te. Bare verbal forms are therefore interpreted as perfective, irrespective of their tense.
Tense marking, on the other hand, is achieved through inflection of the main verb (in the case of perfective forms) or of the imperfective auxiliary.
The imperfective auxiliary therefore provides a convenient illustration of the mixed aspectual-temporal system of Diu Indo-Portuguese: whereas te/tə are the non-Past forms of the imperfective auxiliary, tiŋ is reserved for Past tense.
Source: Cardoso 2009: 327
Source: Cardoso 2004-2008
Source: Cardoso 2009: 331
Source: Cardoso 2009: 147