Answer:
I have a bank, but no money. I have a bed but do not sleep.I have a mouth but cannot eat. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I am whole but incomplete. I have no eyes, yet I see. My largest part is one fourth of what I once was. What am I?
What is black when it's clean and white when it's dirty?
I lose my head in the morning and regain it back at night. What am I?
The answer I give is yes, but what I mean is no. What was the question?