TherearetimesWhenthathehadmadeabigmistake为什么用When不是that或者which什么的

Question

There are times When that he had made a big mistake
为什么用When不是that或者which什么的

Answer 1

There is a time when ...（单数）,There was a time when ...（过去时）,There are times when ...（复数）,这个句型是一固定结构,一般我们记第一句,意思是“有一段时间.”,when 引导时间状语从句,修饰的先行词是 time.
你写的句子里面 he had made a big mistake 这部分时态与主句 There are times 的时态不一致,我认为不太准确,最好改为 he makes a big mistake.