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If we are speaking of the result of a past action rather than of the action we must use the present perfect tense. When somebody says, I have seen Panthenon, he or she is not thinking so much of the past act of seeing it, as the present result of that past action.
Use the simple past tense to express a habit in the past, and not the past continuous
Use the past continuous tense to describe events in the past happening at the time another action took place: I was walking to school when I met him.
If you begin with a verb referring to past time, keep the verb forms in the past. The same rule applies to tenses throughout a composition.
Can changes to could in subordinate clauses, when the verb in the main clause is in the past simple tense.