This document discusses adverbs of frequency, which modify verbs by indicating how often an action occurs. Some key points covered are: - Adverbs of frequency include words like always, never, sometimes, often and they come before the main verb or after forms of 'to be'. - Exceptions to the -ly suffix rule for adverbs include fast and hard. Good becomes well as the adverb form. - Adverbs of infrequency like rarely or seldom are not usually used in questions or negatives. - Adverbs of frequency can be placed at the beginning of sentences for emphasis.