一、后接in doing sth

difficulty后接in doing sth时，意思是“做某事有困难”，其中的介词in含有while的意思，表示“当……的时候”“在……的过程中”，整个结构的意思是“当做某事的时候有困难”“在做某事的过程中有困难”。如：

We had difficulty in finding a parking place. 我们费了很大劲才找到一个停车位。

They shouldn’t have any difficulty in finding the house. 他们找这房子时大概不会有困难。

If you should have any difficulty in getting spare parts ring this number. 万一你买备件时遇到什么困难，请打这个电话号码。

One way of deciding what to do when you have difficulty in choosing the best course of action is to toss a coin. 当人们遇到困难不知选什么行动方案最好的时候，一个办法就是扔硬币来决定干什么好。

注：该结构中的介词in有时可以省略。如：

I had difficulty carrying out the plan. 我执行这项计划有困难。

She was having great difficulty getting her car out, and so I had to move my car to let her out. 当时她正无法把车子开出来，所以我就移开了我的车子让她开出来。

另外，若difficulty后没有出现动名词，而是接名词，则要用with sth。如：liuxuepaper.com