Answer:
I begin your sentences.
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
You throw me out when you use me and take me in when you are done. What am I?
My teeth help me suck.
I run around the streets all day. Under the bed or by the door I sit at night, never alone. My tongue hangs out, waiting to be fed during the day. What am I?
I am your mother's brother's only brother in law. Who am I?