The following verbs have irregular forms for the first person singular of the present tense:
caber (to fit)
yo quepo
caer (to fall)
yo caigo
conducir (to drive)
yo conduzco
conocer (to know, to be acquainted with)
yo conozco
escoger (to choose)
yo escojo
dirigir (to direct)
yo dirijo
hacer (to do, to make)
yo hago
poner (to put, to place)
yo pongo
saber (to know something - a fact)
yo sé
salir (to leave)
yo salgo
seguir (to follow)
yo sigo
traer (to bring)
yo traigo
valer (to be worth)
yo valgo
ver (to see)
yo veo
In addition to memorizing the above listed verbs, you should familiarize yourself with the following three rules:
1. For verbs that end in -cer and -cir, change the c to zc for the yo form:
conocer (to know)
yo conozco
conducir (to drive)
yo conduzco
crecer (to grow)
yo crezco
traducir (to translate)
yo traduzco
establecer (to establish)
yo establezco
producir (to produce)
yo produzco
2. For verbs that end in -ger and -gir, change the g to j for the yo form:
escoger (to choose)
yo escojo
dirigir (to direct)
yo dirijo
emerger (to emerge)
yo emerjo
fingir (to pretend)
yo finjo
3. For verbs that end in -guir, change the gu to g for the yo form:
seguir (to follow)
yo sigo
conseguir (to get)
yo consigo
distinguir (to distinguish)
yo distingo
من طرف 
