Answer:
I am what one cannot keep, two cannot hold, and three cannot destroy. What am I?
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
I am tomorrow's yesterday and yesterday's tomorrow. What am I?
You use a knife to slice my head and weep beside me when I am dead.
What word becomes shorter when you add two letters to it?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.