Here is the passage:
Marina, the beautiful mermaid, wanted some
tuna salad. But had a small problem since she was allergic to celery. At
Sammy’s Sub Shop, Marina hoped to find tuna salad free of this dangerous
vegetable. Flopping across the tiled floor to the counter. Marina placed
her order and then checked her sandwich for celery. Not noticing, however,
the spoiled mayonnaise. At five o'clock that evening, Marina became
violently ill with food poisoning. When a lifeguard at the beach discovered
the problem, he called 911. Even though the mermaid had fishy breath. A
handsome paramedic gave her mouth-to-mouth resuscitation. Wailing like a
sick dog, the ambulance sped off to the hospital.
Where the doctor on call refused to treat a sea creature
with a scaly tail. A kind nurse, however,
had more sympathy. When this caregiver returned with a liquid antacid. Marina
drank the entire bottle, feeling an immediate improvement. The mermaid told
the rude doctor never to swim in the ocean. For she would order hungry sharks
to bite off the doctor's legs. While sharp-clawed crabs plucked out
his eyes. Tossing her long hair, Marina thanked the nurse for the antacid.
And took a mint from David, the handsome paramedic.
Good job! A fragment will not have a main clause. A main clause follows this pattern:
Subject + Verb = Complete Thought.
In the highlighted item, doctor is the subject, and refused is the verb, but notice that this subject-verb pair has where, a relative adverb, coming in front. As a result, you do not have a complete thought.
All you have here is a subordinate clause fragment.