Sentence
The fact that it is "a phrase" suggests that it is not a sentence. It is a fragment (a noun, subject) without a verb as a predicate, e.g. "Eight inches of snow fell."
The bottle was broken into sharp fragments when it hit the floor.
Do you work? is a complete sentence; it is not a sentence fragment.
"She wave." is fragment but "She waves" is a sentence.
fragment
Fragment.
sentence fragment
It is a sentence fragment
is a sentence fragment
Make each fragment into a complete sentence.
"After the storm," is not a complete sentence so it is a fragment.
You are missing the subject and what happened. Who fell from the bicycle and what happened as a result.