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Writing Correct Sentences
Complete, correct sentences express ideas clearly. Avoid sentence fragments, comma splices, run-ons, and rambling or wordy sentences.
Sentence Fragment
A sentence fragment is a group of words that is missing a subject or verb (or both). It does not express a complete thought.

Sentence fragment (no subject)
Is my favorite flavor.
Complete sentence
Rocky road is my favorite flavor.
Sentence fragment (no verb)
Marshmallows and nuts, chewy and crunchy.