翻译英语“我以前从来不知道这个功能”

如果你想表达以前不知道但现在知道了的话，便应该用： I didn't know this function.

I didn't know the function before.

I never aware of this function before.

I haven't known this function yet before.

I never knew this function before.句意为现在知道这个功能了，所以最好用过去时。

I'd never found this function before.