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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.
Use the past perfect when the time of one past action is more past than that of another. Put the action which was completed first in the past perfect and the second action in the past tense.
Don't use the present tense and the past perfect in the same sentence. It would be incorrect to say: My brother says that he had not gone to the cinema last night.
The infinitive simply names an action without reference to person, number or time. Therefore, it can't make sense without the help of a finite verb
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.