Answer:
I am the only thing that place today before yesterday. (one word)
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
u always follow me but I am rarely seen
What can be as big as an elephant but weighs nothing?
I'm the source of all emotion but I'm caged in a white prison.