Answer:
Pronounced as one letter but written with three always in evil never in good and always in zebra never in animal. What is it?
What can travel all around the world without leaving its corner?
I run smoother than any rhyme I love to fall but cannot climb.
If you break me, I'll not stop working. If you can touch me, my work is done. What am I?
Sometimes I annoy you, sometimes you can't live without me. But no matter how hard you try, you can't destroy me. What am I?
No matter how little or how much you use me, you change me every month.