Adverbs of Frequency

• The present simple is very often used with adverb of frequency (always, usually, often, sometimes, seldom/rarely, never, etc.) to show how often something happens. The adverbs of frequency answer the question How often...?.
• Adverbs of frequency come before the main verb (listen, watch, etc.), but after the verb to be and auxiliary or modal verbs, such as do, can, must, etc. The adverbs rarely, seldom and never have a negative meaning and are never used with the word not.
  e.g. Emily never watches horror films.
  You must always behave yourself at school.
  Does Roger often call you during the week?
  Adverbs of frequencу are always coming before auxiliary verb in short answers.
  Do you but expensive clothes? No, I never do.