Frequency adverbs are used to tell how often something happens.
100% always I always go to bed at 11 pm.
90% usually I usually have candy for breakfast.
80% normally / generally I normally go to the gym on Tuesdays.
70% often* / frequently I often surf the internet.
50% sometimes I sometimes forget my wife's birthday.
30% occasionally I occasionally eat fast food.
10% seldom I seldom read magazines.
5% hardly ever / rarely I hardly ever drink alcohol.
0% never I never swim in rivers.