It is very essential to have a clear idea of the difference between Simple Past and Past Perfect Tense since they are used in many situations. You will come to know the exact difference of these two tenses from this video. If you want to learn English properly, then you have to be perfect in all aspects of rules and usages of English grammar. So, Exercise Sentences have been given in the link below.
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Do them without fail and the answer key for the last class has also been given in the link below.
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utilize it when you need.