你甚至都不知道 用英语怎么说

you don't even know it !
100%正确的答案，因为这个问题我曾问过我的美国朋友，以上的都是中式英语。

是的,差不多,再加个at all或许好点
you even don't know it at all!

You even know nothing about it.

you don't even know it!

You do not even know

you even do not know that