I have thought that that when something that I can notice continues up to the present, I should use present perfect. For example:
I have not noticed until now that his car is white.
When the action I could notice happened in the past, I need to use past simple:
I sent him the wrong report and I did not notice until now.
But in the sentence I didn't notice until now that he left, I am not sure whether it is the first case or the second. I tend to think it is the first, as he left and his "being gone" is still valid, so I would say the present perfect should be used..is that correct?
Which one is correct and grammatical?