даже если бы вы не знали кто он так

даже если бы вы не знали кто он такой,вы не должны были говорить с ним в таком тоне

Результаты (английский) 1:

even if you didn't know who he was, you didn't have to talk to him in such a tone

Результаты (английский) 2:

even if you did not know who he is, you should not have to talk to him like that

Результаты (английский) 3:

even if you don't know who he is, you don't have to talk to him like that