Negative Adverbs of Frequency

• For indefinite adverbs of frequency, add not before a positive adverb to form a negative adverb. Use not before the adverb. Place the adverb before the main verb OR after a be verb.

• (+)	always, often, generally, etc.
  (-)	hardly ever, never

• subject + secondary verb + not + adverb + main verb
  

  -She does not usually eat junk food.

  subject + be verb + not+ adverb

  -She is not usually late for work.

• I don't often go to the movie theater.	Carl hardly ever drives to work.*
  The premium burger isn't always available.	Sarah doesn't pay her bills monthly.**

• *Be careful! Do not use not with adverbs of frequency that are already negative.   
  

  I hardly ever go hiking. ̶I̶ ̶d̶o̶n̶'̶t̶ ̶h̶a̶r̶d̶l̶y̶ ̶e̶v̶e̶r̶ ̶g̶o̶ ̶h̶i̶k̶i̶n̶g̶

  **Remember! Always use definite adverbs of frequency at the end of a sentence.

 

Source : Alison