A run-on sentence contains too much information that should be in two or more sentences. For example: She went home and changed her clothes then went out to the porch her friend was there they liked each other that was until they had a fight. A sentence fragment is incomplete, like She thought she... (what?).
Do you work? is a complete sentence; it is not a sentence fragment.
fragment
"She wave." is fragment but "She waves" is a sentence.
Fragment.
sentence fragment
It is a sentence fragment
"After the storm," is not a complete sentence so it is a fragment.
Make each fragment into a complete sentence.
is a sentence fragment
A sentence is a fragment when you do not have a noun/pronoun and a verb.
A fragment sentence is a partial sentence. It does not have everything it needs to be a full sentence. For example: "The dog" is a fragment.
In order to not write a sentence fragment, you must always have a subject in your sentence and a predicate. For example: Fragment: Went to the movies. Sentence: I went to the movies.