This is an irregular verb. It follows the conjugation pattern of the verb incluir.
This verb is more formal. In everyday speech, aproveitar is often preferred.
Present:
A Ana usufrui dos benefícios do programa.
Ana enjoys the benefits of the program.
Preterite:
O Miguel usufruiu dessa oportunidade ao máximo.
Miguel enjoyed that opportunity fully.
Conditional:
A Clara usufruiria desse recurso.
Clara would make good use of that resource.