张老师说得对，最常见的用法可能是 have problems (in)doing sth。 但如果不从常用性来考虑，以下表达都是对的： have problem (in) doing sth （problem 为不 …
“have difficulty / trouble ( in ) doing sth.”意为“做某事有困难”，此句型中difficulty / trouble用作不可数名词，其前可用some, much, a little, no, any, little …
have difficulty doing为正确用法，此用法为固定搭配，意为做某事有困难。 difficulty作困难，麻烦的意思时，指必须付出大量的思考和运用技巧才能解决的任何困难，当 …
She had great difficulty finding a job. UK: People with asthma have difficulty in breathing. It seems that British English puts an extra "in" there while difficulty …
have difficulty (in) doing sth. 是固定句结构，其中的 in 经常被省略。例如： They had great difficulty in finding a replacement. (Longman) 他们很难找到替代者. I had …
更多内容请点击：英语问答：名词 difficulty 后面为什么直接接 –ing? - 知乎