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。例如：

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）