Compound Sentences Require Commas

Many writers a Constant Content eliminate the comma required by a compound sentence. A compound sentence is a sentence that can be broken into two distinct sentences. The pattern may be a variation of subject-verb-object, subject-verb-object. Incorrect: The dog barked and he growled at me. Correct: The dog barked, and he growled at me. This sentence can be broken into two sentences: The dog barked. He growled at me. However, a comma should not be used in a sentence that consists of a subject-verb-object followed by a clause that would, if it were separated from the sentence, become a sentence fragment. Incorrect: The cat was scared, and shaking uncontrollably. Correct: The cat was scared and shaking uncontrollably. Complete sentence: The cat was scared. Fragment: Shaking uncontrollably. The explanation here is decidedly simplistic and is better explained in more depth elsewhere. There are many, many comma resources on the web. Some of these are resources featured on the websites of well-respected institutions of higher education. Any Google search will bring up more results than you need. Please review these so that you writing may be punctuated professionally and without error.