He had some ___in working out the problem.why using difficulty not difficulties?
问题描述：
He had some ___in working out the problem.why using difficulty not difficulties?
答
have some difficulty 是一个成语，“有些麻烦”的意思，是词组当然就是固定用法了。
答
总的说有什么困难 have difficulty doing 这里就指总的困难
其实不必纠结这类 真正与英语母语的人交流这完全可以
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...
答
have some difficulty in doing sth.是个固定搭配，表示有某种困难
在其他情况下，some difficulties（一些困难） 和some difficulty（某种困哪）都是对的