Answer:
To cross the water, I'm the way. For water I'm above, I touch it not and truth to say, I neither swim nor move. What am I?
What has a head and a tail but no body?
Flat as a leaf round as a ring. I have two eyes but can't see a thing.
I'm written with two letters, said with one and seen with two. What am I?
You use a knife to slice my head but you weep beside me when I am dead
No matter how little or how much you use me, you change me every month.