Second and third person pronominal possessors take the form of prepositional phrases with də + personal pronoun, although the phonological integration of the constituents raises the question whether they have merged into special possessive pronouns. Crucially, non-pronominal possessors are also expresed through a də-PP. It is therefore no surprise that, with respect to second and third person pronominal possessors, we find no formal difference whatsoever between their dependent and independent occurrences.
First person possessive pronouns, on the other hand, are formally unrelated to də-PPs, which renders them privileged testing grounds for the question at hand. Whereas their dependent forms are mĩ 'mine' and nɔs 'our', we find that in independent occurrences they may appear as such but, more often than not, appear embedded in a də-PP. Of the three contexts under analysis, elliptical answers seem to be the ones most likely to trigger a bare possessive pronoun.
Source: Cardoso 2004-2008
Source: Cardoso 2009: 160
Source: Cardoso 2004-2008
Source: Cardoso 2004-2008
Source: Cardoso 2004-2008