Answer:
I carry you down a gentle stream.
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. What am I?
He has married many women, but has never been married. Who is he?
I begin your sentences.
My first is in some but not in all. My second is in tiny but not in tall. My third in little but no in big. My fourth in port but not in pig. My whole is made in nature's way. For clothing rugs used every day.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?