This document discusses adverbs of frequency and their placement in sentences. It explains that adverbs of frequency mainly go before the main verb, except when the main verb is "to be", in which case the adverb goes after an auxiliary verb or behind "be" if there is no auxiliary. Examples are provided to illustrate the placement of adverbs of frequency like often, usually, always, and sometimes in affirmative and negative sentences. The document also provides sample questions and responses about frequency to demonstrate asking and answering how often versus how many times something occurs.