Conjugating regular -ER verbs in French

To conjugate for the subject JE, I add (a)   to the stem.

To conjugate for the subject NOUS, I add (a)   to the stem.

To conjugate for the subject IL, I add (a)   to the stem.

To conjugate for the subject ELLE, I add (a)   to the stem.

To conjugate for the subject VOUS, I add (a)   to the stem.

To conjugate for the subject ILS/ELLES, I add (a)   to the stem.

To conjugate for the subject TU, I add (a)   to the stem.

To conjugate a regular ER verb, the first thing I need to do the infinitive verb is get rid of the (a)   .

How do you write I play in French?

(a)  

How do you write she eats in French?

(a)