8.9 be interested doing/to do
 
 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)