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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.
Use the present tense in a future conditional in the if clause and the future tense in the main clause
But the future tense may be used in an if clause expressing a request: If you will/'ll give me some money I will/'ll buy you a drink.
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 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.