Adverbs and expressions of frequency:
always, usually, normally, often, sometimes, occasionally, rarely, hardly ever, never
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When we use adverbs of frequency in the negative form, we put the adverb before the main verb.
They don't often work at weekends.
once a day, twice a week, three times a month, four times a year, every so often, now and again, most of the time
at the beginning or end of the sentence