Knowing what makes a complete sentence is IMPORTANT in our writing. Complete sentences help our writing more effective and allow it to flow nicely as it is read.
Complete sentences: A sentence that contains a complete subject and predicate and expresses a complete thought.
Fragment: A group of words that are missing a subject or missing a predicate and can not stand alone as a sentence.
Run-On; A group of words that have at least two parts, either one of which can stand by itself, but the two parts have been connected together with one or two words instead of becoming two sentences. The run-on could be corrected with added punctuation.