How should I use cover letter to show off communication skills?

Your cover letter tells about you as a person in words, but also does by its formatting and content. To show that you have excellent communication skills, format the letter properly, consulting resources such as a writing manual or the internet for help in formatting. Also, the cover letter should closely follow the advertisement and answer what it seeks in a job applicant. An employer will wonder about comprehension skills and perhaps toss the application if the response cover letter does not mention their ad, the job title, and correspond with how the applicant is qualified.