Answer:
When I am caught I am thrown away. When I escape you itch all day.
Sing me to a baby about to go to sleep.
You can always find me in the past. I am created in the present, but the future can not change me. What am I?
When set loose I fly away. Never so cursed as when I go astray.
If you lose me you may cause people around you to lose me too.
When is it bad luck to see a black cat?