Question

is this a sentence fragment?
in the early 1800s, yellow fever, a viral disease spread by mosquitoes, not by unsanitary conditions as was believed at the time.
yes no
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Explanation:

A sentence fragment is an incomplete sentence lacking a main verb or a complete thought. The given text: "In the early 1800s, yellow fever, a viral disease spread by mosquitoes, not by unsanitary conditions as was believed at the time." has a subject ("yellow fever") but no main verb to complete the thought. It describes yellow fever but doesn't have an action or state - of - being verb that makes it a complete sentence. So it is a sentence fragment.

Answer:

yes