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The verb to use doesn't express a habit in the present. I use means I employ: I use a pen to write with.
Used to expresses a past state or habit and it usually refers to some old situation which no longer exists: I used to see him every day; My father used to play football very well.
Express a counterfactual (that didn't happen) condition by the past perfect and use the past conditional in the main clause. This use of the past perfect doesn't indicate a time but an impossible happening.
After the verbs can, must, may, shall, and will, use the infinitive without to , and not the third person of the present.
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.