We use some adverbs to describe how frequently we do an activity.
These are called adverbs of frequency and include:
100% always I always go to bed before 11 p.m.
90% usually I usually have cereal for breakfast.
80% normally / generally I normally go to the gym.
70% often* / frequently I often surf the internet.
50% sometimes I sometimes forget my wife's birthday.
30% occasionally I occasionally eat junk food.
10% seldom I seldom read the newspaper.
5% hardly ever / rarely I hardly ever drink alcohol.
0% never I never swim in the sea.
These are also known as Adverbs of INDEFINITE frequency as the exact frequency is not defined.
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