为什么是Do you have any difficulty in your studies?在这句里any后不该加名词

为什么是Do you have any difficulty in your studies?在这句里any后不该加名词 Do you have any --------in learning English?（difficulty） DO you have any difficulty ____ listening? any后名词加s吗如Do you have any brother还是brothers? DO you have any other sizes?为什么这句中的any other后是名词复数形式呢? Do you have any activities in your DO you have any other sizes?any other不是加名词单数吗?这句后面为什么加S? do you have any difficulty to get rid of do you have any difficulty ____ understanding spoken english 1.Do you have any difficulty for understanding English? Do you have any difficulty ____(study) physics Did you have any difficulty in learning English last year