interest名词,兴趣.what’s your interest?--你的兴趣是什么?
interested,动词,对...感兴趣,或者...使我感兴趣.what are you interested in?--你对什么感兴趣?it is interested me.它让我感兴趣.
interesting,形容词,有趣的,it is very interesting.--它很有趣.
都是举的最简单的例子,