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Saber (pret)
found out, learned
Saber (imperf)
knew (a fact)
conocer (pret)
met for the first time
conocer (imperf)
knew, was acquainted with
Querer (pret)
tried to
Querer (imperf)
wanted to
No querer (pret)
refused to
No querer (imperf)
didn't want to
Poder (pret)
managed to, succeeded in
Poder (imperf)
was able to, could