This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
O Lucas abandona projetos rápido demais.
O Lucas abandona os projetos depressa demais.
Lucas abandons projects too quickly.
Preterite:
Eles abandonaram a casa.
They abandoned the house.
Imperfect:
A Ana abandonava as coisas pela metade.
A Ana abandonava as coisas a meio.
Ana used to abandon things halfway.