Four days ago I am sad that I did not get a message from you. What happened or not. You busy or that you are sick or not. If you are not happy to talk to me, it does not matter
I sadly four days and I did receive a message from you. What happens? You go, or if you are not comfortable? If you do not have the pleasure to speak with, I don't mind
I am sad, and then the fourth day I do not get a message from you what's the matter, or that you are not too busy, or do you feel happy? If you do not have to talk to me, it does not matter