Preterite Imperfect ( pretérito imperfecto)
The preterite imperfect tense express a repetitive,  habitual  or continuous action or event in the past.
It is used to express how the action or event developed .
Is used to express  a state of mind in the past
To express repetitive, habitual or continuos action or state in the past
Juan caminaba hasta la escuela todos los dias Juan used to walk to school every day
Nos tomábamos vacaciones cada 6 meses We used to have vacations every 6 months
To express a  continuos action or state viewed as being in progress in the past
Yo leía mi libro favorito I was reading my favorite book
Juan y Daniel construían casas y las vendían Juan y Daniel used to build and sell houses
To express action developed
Después de la escuela íbamos a  nadar  After school we used to go swiming
Jugaban al futbol los domingos They used to play football every Sunday.
To express a state of mind
Pedro pensaba  ser arquitecto Pedro used to think to be an arquitect
Creíamos que era verdad We believed it was truth
Regular - AR -  verbs
The imperfect tense of regular ¨ar¨ verbs is formed by dropping the ¨ar¨ ending that the verbs have in the infinitive 
and adding the following endings to the person it refers to:
yo aba
él-ella aba The ending of the verbs tells us the person it refers to
nosotros ábamos it is very common to omit the personal pronoun
vosotros abais (yo, tú, él, ella, nosotros, vosotros, ellos)
ellos aban
infinitive verb
cantar ( to sing) bailar ( to dance) estudiar( to study)
indicative (preterite imperfect tense)
yo cantaba bailaba estudiaba
cantabas bailabas estudiabas
él-ella cantaba bailaba estudiaba
nosotros cantábamos bailábamos estudiábamos
vosotros cantabais bailabais estudiabais
ellos cantaban bailaban estudiaban
María cantaba muy bien María was singing very well
Nosotros estudiábamos mucho We used to study  a lot
Ellos bailaban un Tango They were dancing a Tango
Regular  - ar -  verbs Regular  - er -  verbs Regular  - ir -  verbs
Irregular - er - verbs Irregular - ir - verbs
Regular - AR -  verbs
All ¨ar¨ verbs are regular in the imperfect tense.
There are no stem changes in the preterite  imperfect tense.

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