Regular Present Simple Conjug.
Remember all the verbs in this exercise are REGULAR and what that means is that they don't go through additional changes other than the ending changes in the present simple tense:
-ar verbs: -o, -amos, -a, -as, -an
-er verbs: -o, -emos, -e, -es, -en
-ir verbs: -o, -imos, -e, -es, -en