A sentence fragment is a group of words that lacks a complete sentence structure and does not express a complete thought; it needs to be completed with a subject and a verb; that is, a complete idea.
Sentence fragments can occur when a writer does not provide enough information to complete a thought or when they use dependent clauses without attaching them to an independent clause. They can also occur when a writer mistakenly ends a sentence, making it incomplete.
To avoid sentence fragments, one should ensure that every group of words expresses a complete thought, including a subject and a verb. One can also combine sentence fragments with independent clauses or add necessary information to make a complete sentence. Additionally, one should avoid ending a sentence with a conjunction or a preposition, as this can create a sentence fragment. Proofreading and revising one’s writing can also help catch and correct sentence fragments.