1. Jane is a good friend of mine. I (know/ have known) her very well.
2. Jane is a good friend of mine. I (know/ have known) her for a long time.
3. "Sorry I'm late. How long (are you/ have you been) waiting?" "Not long. Only five minutes."
4. "How long (do you live/ have you) Jived in this house?" "About ten years"