Do you mean the "general" difference between the Imperfect and the Preterite? or just for verb "ser"?
Here is a lesson on the general difference that can help you:
Using El Imperfecto vs El indefinido
The past imperfect refers to the imperfect tense also known as the preterito imperfecto; whereas the past indefinite refers to the present perfect tense, which is the tense formed by the present tense of haber combined with the past participle of a verb. example He comido-I have eaten.
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