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The adverbs of frequency show us how often something happens.

Go beforebefore the main verbsmain verbs in simple tenses:

e.g. I usuallyusually work on Saturdays.

They nevernever drink coffee.

But they go afterafter verb to beto be in simple tenses.

e.g. It is oftenoften cold in winter.

He is alwaysalways late for work. Go after auxiliary verbs (can, do, etc)

e.g. He can nevernever wake up before 10 o’clock

They don’t oftenoften go to the cinema.