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PRETERITE VS. IMPERFECT

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USES OF PRETERITE VS. IMPERFECT TENSES

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When speaking in Spanish about the past, you can use either the preterite or the imperfect, depending on the meaning you want to express. Here is the basic difference between these two forms of past tense.

USES OF PRETERITES

Preterite is used for actions in the past that are completed, and to narrate specific events:

Julia habló con la maestra ayer   
Julia talked to the teacher yesterday
Los muchachos jugaron fútbol la semana pasada  
The boys played soccer last week

Preterite is also used to give a sequence of actions in the past:
Julia llegó a la escuela, habló con la maestra y fue a la biblioteca  
Julia arrived to school, talked to the teacher and went to the library
Ellos entrenaron en el gimnasio el jueves y jugaron fútbol el viernes  
They trained in the gym on Thursday and played soccer on Friday

USES OF IMPERFECT

Imperfect tense is used to describe continuing or incomplete actions in the past without saying when the action begins or ends:
Las chicas bailaban   the girls were dancing
El perro ladraba mucho  
the dog was barking a lot

Imperfect tense is used to talk about actions that happened repeatedly in the past or something that you used to do as a matter of habit:
La señora Rojas comía mucho   Mrs. Rojas used to eat a lot
Lorena estudiaba todas las noche   Lorena used to study every night

Imperfect is used to talk about what people were doing when something else occurred - when two or more actions took place at the same time:
Mientras Angie veía televisión, Juan Alejandro estudiaba para el examen de Historia  
While was watching TV, Juan Alejandro was studying for the History exam 

Imperfect tense is used to speak how old someone was, to say what date and time it was when something else happened (preterite):
Yo tenía 19 años cuando conocí a mi esposo  
I was 19 years old when I met my husband
Eran las 10 de la noche cuando llegó Carmen  
It was 10:00PM when Carmen arrived

Preterite and imperfect are used together when an action (preterite) interrupts another action that is taking place (imperfect):
Yo hablaba con Mercedes cuando llamó Hernando  
I was talking to Mercedes when Hernando called
Mientras Arturo caminaba en el centro comercial, sonó el teléfono
  
While Arturo was walking in the mall, the telephone rang

WORDS THAT ARE SUGGESTION FOR USING THE PRETERITE TENSE:

Ayer   yesterday
Anteayer   the day before yesterday
Anoche   last night
La semana pasada   last week
Hace una semana   a week ago
El mes pasado   last month
Hace un mes   a month ago

El año pasado   last year
Hace un año   a year ago
Una vez   once
Dos veces   twice
Tres veces   three times... etc
De repente   suddenly
En ese momento   at that moment

WORDS THAT ARE A SUGGESTION FOR USING THE IMPERFECT TENSE:

Mientras   while
Siempre   always
Generalmente   in general
Normalmente   normally
Usualmente   usually
A veces   sometimes
Con frecuencia/frecuentemente   often/frequently
De vez en cuando   once in a while
Todos los días/cada día   every day

Todos los lunes/los lunes   every Monday
Todos los martes/los martes   every Tuesday... etc
Todas las semanas/cada semana   every week
Todos los meses/cada mes   every month
Todos los años/cada año   every year
Todo el tiempo   all the time
En aquel tiempo   at that time

SPANISH VERBS WITH DIFFERENT MEANING DEPENDING ON WHICH PAST TENSE IS USED

Conocer
Preterite: to meet a person for the first time
Yo conocí a mi esposo en la universidad   I met my husband at the university
Imperfect: to know a person or place
Rubiela conocía a su hermana muy bien   Rubiela knew her sister very well

Poder
Preterite: to be able
Daniela pudo hacer el crucigrama   Daniela was able to do the crossword puzzle
Imperfect: could - possiblity
Andrea podía entrar al cine gratis   Andrea could get into the movie theater for free

Querer

Preterite: to try
Elena quiso estudiar en la universidad   Elena tried to study in the university
Imperfect: to want/to love 
Elisa quería usar un vestido rojo   Elena wanted to wear a red dress

No querer
Preterite: to refuse
Yo no quise comprar la comida   I refused to buy the food
Imperfect: not want
Marcos no quería ir a la fiesta   Marcos did not want to go to the party

Saber
Preterite: to learn/to find out
Josefina supo del paradero de su hijo   Josefina found out the whereabouts of her son
Imperfect: to know
Yo sabía cuando Hernando venía   I knew when Hernando was coming