It appears that Nicaraguan Creole English does not permit the co-occurrence of three preverbal TAM-markers. In the present-day variety, the postverbal progressive marker -in (derived from the English present participle ending) is much more frequent than preverbal de. As for the past/anterior, more and more English past tense forms occur. Holm (1978: 251–254) indicates that mi and di(d) are allomorphs and does not make any further comments on their distribution. On the basis of recent data, it seems clear that mi is more basilectal than di(d). In combination with the past/anterior marker mi, the progressive marker may become di, probably as a result of vowel harmony.
Source: Holm 1978: 259