Difference between imperfecto and indefinido

For actions that took place in the past

For habits or repeated actions in the past.

For actions completed at a definite moment in the past

For specific actions or events in the past.

For  series of actions or events completed in the past.

To describe people or states of indefinite duration in the past with no reference to its beginning or end.

For actions that, because of their nature, are not usually repeated such as to get married (casarse), to turn a specific age (cumplir años),to realize something (darse cuenta de), to decide (decidir), to graduate (graduarse), to die (morir), etc.

La hija de  Ana nació en ese hospital (Ana’s daughter was born in that hospital).

To express age in the past

To express time in the past

To express a mental state or a mental action.

To know something well:

Mi amiga se conoce la ciudad al dedillo.

To meet for the first time:

Le conocí en un centro social.

To know something:

No sabíamos que el trabajo era tan duro.

To know about something:

Supimos del hotel por un amigo.