If you were interested you are not anymore. You are interested meaning you still are: you were interested in one guy but now you are interested in a different one.
You can use an IUD anytime you are interested in avoiding pregnancy.
Are you interested in politics? No, I am not into politics.
The dwarves are interested in (as dwarves are wont to be) tales of gold and treasure, and Beorn, having little use for these items - - he has everything he needs - - is not interested in material wealth.
It depends on what country you are interested in?
Lawyers aren't interested in friendly; they are interested in accurate, and at least in documents, neutral.
Paleontologists are especially interested in the study of fossils.
Yes, I am interested in dessert.
Yes, I am interested in dessert.
Yes if you find a good program that will keep kids interested then they will use it.
The brakes in my car are hydraulic.
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We are interested to know what motivates and engages adult learners.