题目内容：

He had some ___in working out the problem.why using difficulty not difficulties?

优质解答

some在这里不是表示数量的意思,而是强调“有”（可用于肯定与疑问中）,修饰可数名词与不可数名词均可.would you please lend me some money?用some表示希望对方也相信对方会借钱给自己,如果some换成any就是不太确定...