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An adverb of frequency can go:
before the main verb
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He always goes to work by bus.
They never go on holiday in winter.
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after the verb be
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John is often absent from lessons.
They were usually on time.
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after modal verbs, should, can, could, etc.
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You should always turn the electricity off.
My boss can never remember my name.
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Sometimes and occasionally can go in the front, middle
or end position in the sentence.
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Sometimes she is late.
She is sometimes late.
She is late sometimes.
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