Looks like no one added any tags here yet for you.
Conocer
Preterito:
Def - to meet
Explination - Just met for the first time
Example - José conoció a todos las chicas guapas en la fiesta.
Imperfecto:
Def - to know
Explination - known for a while
Example - José conocía a todos las chicas guapas en la fiesta
Saber
Preterito:
Def - to find out / to realize
Explination - just got the information
Example María supo que Carlos no tenía novia
Imperfecto:
Def -
Explination - previosly knew
Example María supo que Carlos no tenía novia
Poder
Preterito:
Def - to manage
Explination - completed the action, succeeded
Example Rosa pudo hacer caca
Imperfecto:
Def - to be able to
Explination - has the ability to but may not have done it
Example Rosa podía hacer caca
Querer
Preterito:
Def - to try
Explination - attempted to kiss
Example Santi quiso besar a Margarita
Imperfecto:
Def - to want
Explination - desire to kiss
Example Santi quería besar Margarita
haber
Preterito:
Def - to happen to
Explination - ??
Example Hubo un accidente en la calle
Imperfecto:
Def - there was
Explination - ??
Example Había un accidente en la calle.
tener
Preterito:
Def - to recieve
Explination - He had to read (new information)
Example Juan tuvo buenas notas en el cole
Imperfecto:
Def - to have
Explination - He knew he had to read
Example: Juan tenía buenas notas en el cole
no poder
Preterito:
Def - to fail to
Explination - failed at completing the action
Example Jaime no pudo Subirse las pantalones
Imperfecto:
Def - to not be able to
Explination - knows that they will fail
Example Jaime no podía subirse los pantalones
no quere
Preterito:
Def - to refuse
Explination - ? ?
Example Migues no quiso ponerse los calzoncillos.
Imperfecto:
Def - to not want
Explination - ? ?
Example Miguel no quería ponerse los calzoncillos.