before the main verb: often, sometimes, usually, always, occasionally, seldom, rarely, never, at the end of the clause: once (a day), twice (a week), three times (a month), several times (a year), hourly, daily, monthly, yearly, every hour, every day, every month, every year, on Saturdays, on weekedays, at weekends, once in a while, once in a blue moon (expression), on Sundays,

Indefinite and Definite frequency adverbs

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