Past imperfect vs preterite 

We have to explain the past imperfect vs preterite because there is no equivalent in English for the imperfect. Once you form your first language at the age of 11, we have to explain it this way for the path of least resistance, unless you just move to another country and you learn the hard way. First lets check on the grammar which is very easy:

Here is the complete material for this class. 

Imperfect regulars

Imperfect Irregulars

 

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