For example :
-AR : abarcar ( to include) , aceptar (to accept),....
-IR : abrir (to open) , conducir (to drive),...
-ER : leer (to read) , comer (to eat) ,..
In all tenses in Spanish, verbs are conjugated regularly and irregularly. It's really complicated because only present tense there are many verbs which are irregular in "yo" form but some are irregular in all of forms except for nosotros/vosotros....
But the more you learn,the more interesting you'll find about this language.
Let's begin with regular verb in present tense.
Regular -AR verb;