why didn't I ever know that? / why don't i ever know that? If Someone is letting me know an information that i didn't know before and then i am realizing i was mistaken now, which one is more correct between 'why didn't i ever know that?' and 'why don't i ever know that?' in this situation? i think the first one seems close to the correct one.. but to realize that i was mistaken is happening now!! .. Using the second one sounds awkward in this situation? if so, when can i say 'why don't i ever know that?'? it's confused(is it right? or do i need to say "confusing?") for me to choose a right english tense. thanks in advance :)