Irregular verbs with their irregular forms, their irregular stems in present and past-2 tenses.
SABER – to know
YO SÉ – I know
Present stem SAB-
Past 2 stem SUP-
DORMIR – to sleep
Present stem DUERM-
PENSAR – to think
Present stem PIENS-
OÍR – to hear
YO OIGO – I hear
CONOCER – to know
YO CONOZCO – I know
SENTIR – to feel
Present stem SIENT-
QUERER – to want
Past stem QUIS-
DECIR – to say
YO DIGO – I say
Present stem DEC-
Past stem DIJ-
HACER – to do
YO HAGO – I do
Past stem HIC-
PONER – to put
YO PONGO – I put
Past stem PUS-
VENIR – to come
YO VENGO – I come
Present stem VIEN-
Past stem VIN –
PODER – can
Present stem PUED-
Past stem PUD-
PERDER – to lose
Present stem PIERD-
CONTAR – to tell
Present stem CUENT-
CRECER – to grow
YO CREZCO – I grow
SALIR – to leave
YO SALGO – I leave