Answer:
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
What loses its head in the morning but gets it back at night?
I hold two people together but touch only one. What am I?
I shift around though always slowly. I never move more than a few inches at a time. A large movement by me can kill many people. I am huge yet unseen by humans.
What comes in many different sizes but is always only 1 foot long?
What language does a billboard speak?