#irregular yo form

Caber – to fit quepo

Caer – to fall caigo

Dar – togive doy

Estar – to be estoy

Hacer – to do/make hago

Poner – to put pongo

Saber – to know sé

Salir – to leave salgo

Traer – to bring traigo

Valer – to be worth valgo

Ver – to see veo

Irregular compounds in the yo present tense

Other Spanish verbs have some of the words above in that word, for instance proponer – to propose has poner in it and as a result has a similar irregular yo present tense form.  

Poner verbs: Componer – to compose compongo

Disponer – to arrange dispongo

Proponer – to propose propongo

Reponer – to replace repongo

Suponer – to suppose supongo

Tener: Contener – to contain contengo

Detener – to detain detengo

Mantener – to maintain mantengo

Obtener – to obtain obtengo

Retener – to retain retengo

Sostener – to sustain sostengo

Traer: Distraer(se) – to distract distraigo

Hacer: Deshacer – to undo deshago

Rehacer – to remake rehago

 -cir and -cer verbs -> zco

Some verbs that end in cir and cer when in the yo present tense form change to -zco instead of –co

Er verbs: Agradecer – to be thankful/grateful ­agradezco

Aparecer – to appear aparezco

Complacer – to please complazco

Crecer – to grow crezco

Establecer – to establish establezco

Merecer – to deserve merezco

Ofrecer – to offer ofrezco

Padecer – to suffer padezco

Permanecer – to remain permanezco

Pertenecer – to belong pertenezco

Reconocer – to recognize reconozco

Ir verbs: Traducir – to translate traduzco

Conducir – to drive conduzco

Producir – to produce produzco

cer/cir -> -zo

Some verbs have a cer/cir ending but do not have the –zco ending, instead they have a –zo ending:

Covencer – to convince covenzo

Ejercer – to practice (a profession) ejerzo

Vencer – to overcome venzo

 -ger/-gir -> jo

Some verbs have a ger/gir ending but in the yo present tense form are –jo, this is to keep the soft g sound of the verb.

Er: Coger – to catch cojo

Encoger – to shrink encojo

Proteger – to protect protejo

Recoger – to pick up recojo

Escoger – to chose escojo

Ir: Exigir – to demand exijo

Dirigir – to direct dirijo