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)