1. Missing Subjects
A sentence fragment can occur when the subject is omitted, leaving the sentence incomplete. The reader is left without the main focus of the sentence.
2. Missing Predicates
A fragment can also happen when the predicate (verb) is missing. This makes it impossible to determine what the subject is doing or experiencing.
3. Incorrect Use of Conjunctions
Sentence fragments may result from incorrect or incomplete use of conjunctions. This often happens when dependent clauses are incorrectly punctuated or separated from their main clauses.
4. Punctuation Errors
Incorrect punctuation can lead to fragments, especially when a writer improperly uses commas or semicolons. This can separate clauses that should be connected, resulting in an incomplete thought.
Examples
I wanted to go for a walk, but. (What did you want to do?)
She likes to read; especially mysteries. (What about mysteries?)