Used in the past:

-describe what was happening, used to happen, happened repeatedly

-descriptions

-to tell a story, set the stage of a story

-express state of mind

-express #'s, age, temperature, etc

-emphasize what was going on in the past when another action took place

- ar imperfect endings

aba

abas

aba

ábamos

abais

aban

-er imperfect endings

ía

ías

ía

íamos

i´as

i´an

Ser

era

eras

era

éramos

erais

eran

Ir

iba

ibas

i'bamos

iban

Ver

vei'a

vei'as

vei'amos

vei'ais

vei'an