Question

when she lived in paris

Answer 1

Answer:

Without further information, Sara has lived in Paris means she lived there for some time in the past but does not live there now. However, if you add for 20 years, the presupposition is that she does still live in Paris, and did so for the last 20 years. If you wanted to refer to any other 20 years in the past, you'd have to say She lived in Paris for 20 years, which presupposes she left, and that the 20 years mentioned are not the last 20 years. –