Final answer:
The sentence 'the marching band put on a great show' is not a sentence fragment; it is a complete sentence with a typo corrected. It has a subject and a predicate, thus expressing a complete thought.
Step-by-step explanation:
The sentence in question, "the marching band put on a great ahow," is actually not a sentence fragment but contains a typo. The correct term should be 'show' rather than 'ahow.' With the correct spelling, the sentence is complete, consisting of a subject ('the marching band') and a predicate ('put on a great show'), which conveys a complete thought. The subject is doing something, which is described by the verb and the object of the verb.
When evaluating sentence structure, it is important to identify the subject and the predicate. A complete sentence contains at least one independent clause with a subject that is actively doing something or being something, paired with a predicate that shows action or a state of being. Fragments lack either a subject, a predicate, or fail to express a complete thought.