There are certain subjects that when talked about in the past should use the Imperfect tense only. These catagories include:

 

Physical conditions

Location

Emotional state

Appearance

Dates

 

Weather

Age

Age/desires

Time

Examples:

1. Yo estudiaba en la computadora a la escuala.

     I studied on the computer at the school.

2. Yo no vivÍa con no movil.

     I could not live with no cell phone.

http://www.studyspanish.com http://www.rocketlanguages.com/spanish/imperfect_spanish_past.php http://www.123teachme.com/learn_spanish/imperfect_tense_2 http://www.bellaonline.com/articles/art32108.asp http://www.dummies.com/how-to/content/expressing-uncertainty-in-spanish-with-the-imperfe.html http://spanish.about.com/od/verbtenses/a/two_past_tenses.htm http://www.onlinespanishhelp.com/ http://www.drlemon.net/Grammar/pretvsimp.html http://www.learn-spanish-help.com/ http://www.spanishclassonline.com/
 
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