he doesn't know what he
He doesn't know what he's doing!
Er weiß nicht, was er tut, oder?
He doesn't know what he's doing, does he?
— Harry Potter und die Heiligtümer des Todes - Teil 1 (2010)
He doesn't know what he's doing.
Er hat zu viel getrunken, er weiß nicht, was er sagt.
He drank too much; he doesn’t know what he’s saying.
Er weiß nicht, was er tun soll.
He doesn't know what to do.