This activity is for the student to get more familiar with the conjugations of REGULAR VERBS in the present simple based on the ending of the verb in its infinitive form (-ar/-er/-ir) and the pronoun (él, ella, usted, yo, etc.)
Ejemplo: comer
Ella comE

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

Enjoy!