26 Conjugation of Regular Present Tense Verbs
The present tense indicates an action that is either recurring, habitual, or a general truth, a so-called eternal verity.
The present tense endings differ according to the verb category. In Spanish regular verbs can be classified into 3 main groups: -ar, -er, and -ir.
Irregulars
There are 4 main types of irregular verbs in the present tense: stem changers, irregulars in the yo form, irregular in all forms, spelling changers.
Stem Changers
There are three types of stem changers: e-> ie, e-> i, o-> ue
Irregular in the yo form
c-> zc
conocer
-g
decir, venir, hacer, tener
others
dar, saber, caber
Irregular in all forms
ser, ir, estar, oler
Spelling changers
g > j: Verbs whose infinitive form ends in -gir change the g to j before an a or an o.
gu > g: Verbs whose infinitive form ends in -guir drop the u before an a or an o.