PRESENT: Irregular in the YO form

The majority of irregular verbs in the YO form are also called GO verbs because the first person conjugation ends in GO. These verbs tend to be irregular in other tenses as well. Here the most common GO verbs along with their GO conjugation.

hacer	to do, to make	haGO
decir	to say	diGO
salir	to leave	salGO
tener	to have	tenGO
traer	to bring	traiGO
venir	to come	venGO

Two other common verbs which are irregular in the YO form but don't follow the above pattern are dar and ver.