建议网友不要“泛泛而问”，应该给出例句。

in doing sth. 在不同语境中，作用是不同的。例如：

He spent much of his time in preparing the report.（方面状语）

He learnt a lot from the farmers in doing farmwork. （时间状语）

In doing so, he did a great service to the nation. （方式状语）

What is your purpose in doing that? （定语）