Fragments are incomplete sentences that are missing a subject, a verb, or both, and are punctuated as if they were complete sentences.
You always need a subject and a verb to make a complete sentence.
In this example, But had no money has no subject.
WRONG: I was trying to register for school last week. But had no money.
You can fix the problem by joining the two sentences with a comma and adding the subject I.
CORRECT: I was trying to register for school last week, but I had no money.
In this example, the main verb is missing.
WRONG: The lab the most problematic section of the Biology course.
You can fix the problem by adding a verb to complete the subject-verb agreement.
CORRECT: The lab was the most problematic section of the Biology course.
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