I realized that it doesn't matter if I don't know each word.这个句子中为什么doesn't不变过去式

I realized that it doesn't matter if I don't know each word.这个句子中为什么doesn't不变过去式
I realized that it doesn't matter if I don't know each word.这个句子中为什么doesn't不变过去式

I realized that it doesn't matter if I don't know each word.这个句子中为什么doesn't不变过去式
这里说的是事实,在宾语从句中如果说的是公理或事实要用一般时.