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Regardless whether you are an engineer or a writer, a professional or a student, a business person or a scientist, you will be expected to communicate effectively with your supervisors, colleagues, clients, and the public. For most, thatcommunication includes at least an occasional formal presentation.
Successful writers write to win. Whether a writer wants to achieve a particular grade on a paper, persuade a specific audience to adopt an argument, or obtain an interview with a company, a writer writes with a purpose that he or she aims to fulfill. Using rhetorical appeals, particularly in persuasive writing, is a powerful way to persuade an audience.
Why use rhetorical appeals in persuasive writing? Using rhetorical appeals in persuasive writing increases a writer’s chances of achieving his or her purpose. Any rhetorical purpose must be connected to an audience, and rhetorical appeals have been proven to successfully reach and persuade audiences.

Because commas cause readers to pause in their reading, you want to use them sparingly. Although logic would suggest that it makes sense to follow coordinating conjunctions with commas, convention does not call for this usage unless the conjunction is followed by an introductory phrase. Thus, it would he inappropriate to write:

  • Yet, I think we should go ahead as planned.

When a short phrase follows the conjunction at the beginning of the sentence, however, it is appropriate--although not absolutely necessary--to place a comma after the conjunction:

  • Yet, as I mentioned yesterday, I think we should go ahead as planned.

 

Other comma resources: