Preterite:
Verbs which take on a special translation in the Preterite:
Conocer
conocí
I met
Saber
supe
I learned, found out, discovered, etc..
Poder
pude
I (tried and) succeded, managed
no pude
I failed
Querer
quise
I wanted to and did, I attempted, etc...
no quise
I refused