Every verb type has regular and irregular forms. We now have a look at the regular ones. Those are anyway the majority of the verbs.

First we need to find the stem of the verb that is done by removing the standard verb ending of the infinite (not changed) form. The stem of trabajar (to work) is trabaj (-ar was removed). Then the conjugate endings are put in place:

yo trabajo   tú trabajas   él trabaja   ella trabaja   nosotros trabajamos   nosotras trabajamos   vosotros trabajáis   vosotras trabajáis   ellos trabajan   ellas trabajan I work you work he works she works we work (masculine) we work (feminine) you work (masculine) you work (feminine) they work (masculine) they work (feminine)

Here comes a second example. The stem of the verb hablar (to talk) is habl (ar was removed )

yo hablo   tú hablas   él habla   ella habla   nosotros hablamos   nosotras hablamos   vosotros habláis   vosotras habláis   ellos hablan   ellas hablan I speak you speak he speaks she speaks we speak (masculine) we speak (feminine) you speak (masculine) you speak (feminine) they speak (masculine) they speak (feminine)