1. Apuntes 8-9 de octubre La conjugación de los verbos (Verb Conjugation)
When you conjugate a verb, you change the infinitive so that it shows who is doing the action. The ending of a verb tells who is doing the action.

2. Infinitives are the most basic forms of a verb
Infinitives are the most basic forms of a verb. All infinitives in Spanish end in –ar, -er or –ir. Here are some examples of infinitives:
hablar (to speak)
trabajar (to work)
estudiar (to study)
comer (to eat)
escribir (to write)

3. In order to conjugate a verb, you must take off the –ar, -er or –ir from the infinitive. This leaves you with the verb stem. Here are the verb stems of some sample verbs:
infinitive verb stem
escuchar escuch-
estudiar estudi-
leer le-
escribir escrib-

4. You complete the conjugation by adding the appropriate ending
You complete the conjugation by adding the appropriate ending. The endings for regular verbs that end in –ar are as follows:
Subject Verb ending
yo -o
tú -as
Ud., él/ella -a
nosotros/as -amos
vosotros/as -áis
Uds., ellos/as -an

5. Here is a complete present-tense conjugation for the verb DIBUJAR.
DIBUJAR (to draw)
Singular Plural
(yo) dibujo (nosotros/as) dibujamos
I draw we draw
(tú) dibujas (vosotros/as) dibujáis
you draw you guys draw
(Ud., él/ella) dibuja (Uds., ellos/as) dibujan
You (formal) draw, he/she draws You (all) draw, they draw

6. When making a sentence, you change the ending to say who is doing the action. The subject pronoun is optional and is often left off.
(Yo) dibujo en la clase de arte. (I draw in art class.)
¿Dibujan (ellos) en la clase de arte? (Do they draw in art class?)

7. To make a sentence negative, put a no in front of the verb.
(Nosotros) no dibujamos en la clase de arte.
(We don’t draw in art class.)