These verbs are commonly used and, since they do not follow the pattern you have learned for regular verbs, they must be memorized.
 

IR (to go)
voy	vamos
vas	vais
va	van

 

PONER (to put)
pongo	ponemos
pones	ponéis
pone	ponen

 

DAR (to give)
doy	damos
das	dais
da	dan

 

DECIR (to tell, say)
digo	decimos
dices	decís
dice	dicen

 

TRAER (to bring)
traigo	traemos
traes	traéis
trae	traen

 

OIR (to hear)
oigo	oímos
oyes	oís
oye	oyen