This is a regular verb. It follows the conjugation pattern of the verb comer.
PresentPresente
Te debo veinte dólares.
I owe you twenty dollars.
ImperfectPretérito imperfecto
Debíamos llegar a las ocho, pero había tráfico.
We were supposed to arrive at eight, but there was traffic.
ConditionalCondicional
Deberías descansar un poco.
You should rest a little.