英语语法I wasn't even aware they were still making pennies中为什么用wasn't?
I wasn't even aware they were still making pennies中为什么用一个wasn't?
句子写成I even have no awareness that they were still making pennies不行么?
句子写成I isn't even aware they were still making pennies不行么?
句子写成I havn't  aware they were still making pennies可以么

原文翻译是 我都不知道还有制造这种便是的
按句子意思就是现在也不知道对吧，那为什么还要用过去式的，而不是isn't