interested to do 对做某事感兴趣，想了解某事。　interested in doing　 对某种想法感兴趣，doing 通常为想法。I shall be interested to know what happens.我很想知道发生了什么事。 (想了解)I'm interested in working in Switzerland. Do you have any idea about that?我对在瑞士工作感兴趣。你想过这事吗?　 (一种想法)