conocía - I knew, I was acquainted with
conocí - I met, made the acquaintance of
costaba - it cost (before purchasing)
costó - it cost (after purchasing)
podía - I could, was able to
pude - I was able to (and did), I managed to
No podía - I was not able to, could not
no pude - I tried (but couldn't), I didn't managed to
Quería - I wanted to, desired to
Quise - I tried to
No quería - I didn't want to
No quise - I refused, would not (also equivalent in Spanish: negué)
Sabía - I knew, knew how to, had knowledge that
Supe - I learned, found out
Tenía - I had (in my possession)
Tuve - I had, received
Tenía que - I had to (but did not necessarily do it)
Tuve que - I had to to (and did do it)
