i don't know what has he done,isn't he?

有问题
i don't know what he has done,do i?
或
i didn't know what he had done,did i?

I didn't know that he has made anything

I don't know what he has done, do I？
I don't know what he has done, hasn't he？

以上均可看你强调哪部分

有问题！！！问题大了！听我的饿

i don't know what has he done,isn't he?
应该是
i don't know what he has done,has he?