interested to do 對(duì)做某事感興趣，想了解某事。

interested in doing 對(duì)某種想法感興趣，doing 通常為想法。

I shall be interested to know what happens.

我很想知道發(fā)生了什么事。 (想了解)

I’m interested in working in Switzerland. Do you have any idea about that?

我對(duì)在瑞士工作感興趣。你想過(guò)這事嗎? (一種想法)