verbos con significado diferente en el pretérito y el imperfecto

tener- pretérito

to get; to recieve

tener- imperfecto

to have

saber- pretérito

to find out; to discover

saber- imperfecto

to know

querer- pretérito

to try

querer- imperfecto

to want

conocer- pretérito

to meet

conocer- imperfecto

to know about; to be familiar with

poder- pretérito

to manage to do; to succeed

poder- imperfecto

to be able to; to have the ability

no querer- pretérito

to refuse

no querer- imperfecto

not to want

no poder- pretérito

to be unable to (and not do)

no poder- imperfecto

to be unable to (in a general sense)