Introducing the topic, .t/.tỉ/.tw-marked forms of the verb are shown to be inflectional passives like V-passives, not active impersonal constructions as advocated in a recent proposal (§1). In a process seen unfolding already in the earliest record, then further during Earlier Egyptian and into the Middle Kingdom, T-passives are observed spreading over V-passives, superseding these in many functions (§2). Like perfective aspect, the prototypical passive views the event from the perspective of its Endpoint. It is proposed that T-passives spread over V-passives in those functions in which the Endpoint was partly or entirely out of focus: in the future, in negative constructions, and in constructions that set the perspective on the event itself, away from the Endpoint. Passives from intransitives are non-prototypical in lacking an Endpoint and in setting the perspective on the event itself: they might have played a supporting role in early stages of the process. Meanwhile, V-passives continued to be used regularly in those environments in which the Endpoint was in focus, with fully asserted events and in adjunct clauses. This macro-change is inserted into the longer-term history of T-passives (§3). Looking up in time, it is proposed that Earlier Egyptian {t} is cognate to {t} found across Afroasiatic languages with varying detransitive functions, and represents the outcome of a well-paralleled path leading from reflexive to anticausative to passive. Looking down in time, it is proposed that passives from intransitives and passives with imperfective aspect, both deviating from the passive prototype, were favorable loci for alternative construals of T-passives as generalized-Agent constructions. Given several favorable conditions on other levels, these contributed to making the extension of .t(w) to active impersonal constructions, beginning in the Twelfth Dynasty, possible. In the broader sweep, the story then goes from {t} as a reflexive marker (in Afroasiatic prehistory) to {t} as an inflectional passive marker (in Earlier Egyptian, with T-passives gradually extending their functional yield over V-passives); and further to innovative uses of .t(w) as an impersonal subject pronoun (emerging during the Twelfth Dynasty and generalizing in Late Egyptian). Three themes are recurrent in this long history: the morphological transparency of T-passives, voice-aspect correlations, and the role of passives from intransitives.
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