THREE RHYMING RIDDLES

1)

Always old, sometimes new,

Never sad, sometimes blue;

Never empty, sometimes full,

Never pushes, always pulls.

2)

Neither fish, flesh, nor bone,

But if you wait, I'll walk alone.

3)

Until I'm measured,

I am not known;

But how you miss me

When I've flown.

Answers:

1. The moon

2. An egg or cocoon

3. Time