How to Conjugate

IR, AR and ER Verbs

By: Ashley Wollett

The base form of a verb is the infinitive. All infinitives end with -ar, -er, or -ir in Spanish.

IR Verbs

-When you conjugate a verb you are manipulating the variable, that way it agrees with the different possible subjects.

-There are two parts to a Spanish infinitive. It includes the ending and the stem. The stem is what is left of the infinitive after you remove the -ar, -er, or -ir.

(viv + ir = vivir)

-You conjugate the verbs by changing the ending. If you have the subject (tú) and the verb vivir, you would conjugate by dropping the ending and adding -es since it is an IR verb.


(yo) = Vivo (nosotros) = vivimos

(tú) = Vives (vosotros) = vivis

(El, Ella, Ud.) = Vive (ellos, ellas, uds.) =viven


The stem of this verb is viv, and to conjugate you add the ending that goes with the subject like the chart above.

AR Verbs

-When you conjugate a verb you are manipulating the variable, that way it agrees with the different possible subjects.

-There are two parts to a Spanish infinitive. It includes the ending and the stem. The stem is what is left of the infinitive after you remove the -ar, -er, or -ir.

(habl + ar = hablar)

-You conjugate the verbs by changing the ending. If you have the subject (tú) and the verb hablar, you would conjugate by dropping the ending and adding -as since it is an AR verb.


(yo) = Hablo (nosotros) = Hablamos

(tú) = Hablas (vosotros) = Habláis

(El, Ella, Ud.) = Habla (ellos, ellas, uds.) =Hablan


The stem of this verb is habl, and to conjugate you add the ending that goes with the subject like the chart above.

ER Verbs

-When you conjugate a verb you are manipulating the variable, that way it agrees with the different possible subjects.

-There are two parts to a Spanish infinitive. It includes the ending and the stem. The stem is what is left of the infinitive after you remove the -ar, -er, or -ir.

(com + er = comer)

-You conjugate the verbs by changing the ending. If you have the subject (tú) and the verb comer, you would conjugate by dropping the ending and adding -es since it is an ER verb.


(yo) = Como (nosotros) = Comemos

(tú) = Comes (vosotros) = Coméis

(El, Ella, Ud.) = Come (ellos, ellas, uds.) = Comen


The stem of this verb is com, and to conjugate you add the ending that goes with the subject like the chart above.