Because I feel that if I don't greet you before you was never greet me before! but when you, the reason it works, I understand, and I apologize if you understood wrong.
Because I feel that if I do not greet you first. You did not greet me before. , but when you make it and I can understand why. And sorry for not understanding you.
Because I feel that if I didn't greet you.? You never say hello to me. But when you give a reason that I can understand. And sorry I misunderstood you.