Adverbs of Frequency in English Grammar. The word which expresses frequency or how often something occurs. There are two types : Adverbs of definite frequency and Adverbs of indefinite frequency. adverbs of frequency, uses of adverb of frequency, examples of adverbs of frequency, adverbs of definite frequency, adverbs of indefinite frequency https://www.englishmirror.com/english-grammar/adverb-of-frequency.html