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True or False: The following sentence is grammatically correct?
"Dr. Beitler's class that meets at 9:15 worked very hard on their grammar mini lessons, therefore Dr. Beitler will make our rough drafts for the second paper due next week instead of this friday."
False. "Therefore" is an adverb and thus calls for a semicolon before "therefore" and a comma after "therefore" in order to connect the two independent clauses correctly.
"Dr. Beitler's class that meets at 9:15 worked very hard on their grammar mini lessons; therefore, Dr. Beitle will make our rough drafts for the second paper due next week instead of this friday."