Answer:
I am black within and red without; with four corners round about. What am I?
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I follow you all the time and copy your every move but you can't touch me or catch me. What am I?
I begin your sentences.
In birth I spring forth, in life I unfold. In death I wilt and die, but rebirth restores all.