Question

The rain falling furiously from the sky in great sheets. Fragment or Sentence ?

Answer 1

It's a sentence because it has a subject and a verb.

Answer 2

Hey there!

"The rain falling furiously from the sky in great sheets."
This is a fragment. It's a fragment because it does not mention the word "was", "is" or the word "fell".
If it was like this then it would be a sentence: "The rain fell furiously from the sky in great sheets."

Final answer:
Fragment

Hope this helps you.
Have a great day!