I moan, I groan, I chase after you. I never seem to rest. Time’s up for you. What am I?

Answer: Children

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I move at a tremendous speed, as fast as a car, and yet I’m always at the same place. What am I?
I move without wings, Between silken string, I leave as you find, My substance behind. What am I?
I move without wings, between silken strings. I leave as you find my substance behind. What am I?
I must be broken before you can use me. What am I?
I never ask questions, but I am always answered. What am I?
I never speak unless spoken to, many have heard me but none have seen me. What am I?
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves everyday. What am I?
I no longer have eyes, but once I did see. Once I had thoughts, but now I’m white and empty. What am I?
I only exist when you are here. Where you never were, I can never be. What am I?
I only have one entrance, but you can come out with three exits. What am I?
I only have two backbones and thousands of ribs. What am I?
I pass before the sun, yet make no shadow. What am I?