Eloi Singla send me a WhatsApp with a very interesting observation about the future particle.

The future for a verb can be formed with རྒྱུ་ as in འགྲོ་རྒྱུ་ཡིན།

He says how now in spoken colloquial we might be using གི་ because it got distorted with time from རྒྱུ་ to གི་ when speaking fast.

རྒྱུ་ carries with it a sense of obligation.

He then compares a similar process that happened in Catalan language, where the future tense might get the conjugations from the verb “to have”:

Conjugated VerbOrigin
cantaré
cantaràs
cantarà
cantarem
cantareu
cantaran
cantar he
cantar has
cantar ha
cantar heu
cantar hem
cantar han