Regular verbs in Spanish are divided into three groups, according to the ending of the infinitive: -ar, -er, -ir. To conjugate these verbs in the simple present tense, you remove the infinitive ending and add the corresponding ending for the subject.

1. Verbs ending in -ar:

2. Verbs ending in -er:

3. Verbs ending in -ir:

That's it, following those patterns you will be able to conjugate any spanish regular verb in present tense!