The document discusses frequency adverbs and Sheryl's weekly schedule. It provides examples of frequency adverbs like "always", "usually", and "sometimes" using Sheryl's schedule. Sheryl always has class at 8:00 am, usually plays tennis at 4:00 pm, and sometimes goes dancing on Fridays. She never goes to the movies. The document also notes that frequency adverbs go before the main verb in a sentence.