i have made the same mistake three times.mistake为什么不加s?不是是三次同一个错误吗?为毛就不是复数呢

问题描述:

i have made the same mistake three times.mistake为什么不加s?
不是是三次同一个错误吗?为毛就不是复数呢

因为是the same mistake 是同一个错误,所以是单数