Its aquellos but im not to sure which one of those two
Nosotros debemos a estudiar mas
The answer is "Nos gusta". That means "we like".
To conjugate them, you drop the -ir ending, like you would with a regular verb like finir. Then you add, well, the regular -er verb endings: -e, -es, -e, -ons, -ez, and -ent!