C. H. Grandgent,
An Outline of the Phonology and Morphology of Old Provençal
“ The Latin perfect came to be restricted to its aorist sense, and the perfect was expressed by compounds of habēre with the perfect participle. In the Romance languages all compound tenses were eventually formed in this way: ai cantat, avia cantat, aurai cantat, etc. In Provençal the auxiliary is sometimes ęsser, instead of avẹr, if the main verb is reflexive, passive, or neuter; ęsser is particularly common with neuter verbs of motion: sọi vengütz. [112] A participle used with avẹr may agree in gender and number with the direct object, if there is one: ai cantat or cantada la cansọ. ”
