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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.
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.
After the verbs can, must, may, shall, and will, use the infinitive without to , and not the third person of the present.
Don't use the past perfect unless there is another verb in the past tense in the same sentence.