Answer:
I go through a door but never go in, and never come out. What am I?
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
My first half means container. Not a lot of people understand my language.
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk