This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
A Ana acusa ele de mentir.
A Ana acusa-o de mentir.
Ana accuses him of lying.
Conditional:
(Eu) nunca acusaria um amigo.
I would never accuse a friend.
Preterite:
Eles acusaram ele de roubo.
Eles acusaram-no de roubo.
They accused him of theft.