[nenevhng]

The Pret?rito Imperfeito,is used to tell something from the past,that hasn't ended,its incomplete.
If you say:eu ca?(pret?rito perfeito)it?s done
but if you say:eu estava caindoit's not complete.
In english it's like the Past tense continuous.
A continued state or repeated action which occurred in the past.Example:
I was watching tv when the doorbell rang.
Espero k te tenha ajudado,mas eu sei k ? complicado.