Adverbs of frequency describe how much we do an activity.[1]https://www.grammar.cl/Basic/Adverbs_Frequency.htm
Adverbs of Indefinite Frequency

Adverbs of indefinite frequency help describe how much we do something but doesn’t define the exact amount of time.
- I always
work out in the morning. - I usually
drink coffee in the morning. - She normally
eats with us. - I generally
do well in school. - I often
eat at this restaurant. - I frequently
visit my parents. - I sometimes
read books. - I occasionally
go to the beach. - I seldom
eat vegetables. - I hardly
ever drive. - I rarely fly
on planes. - I never
lie to my friends.
Adverb Position
There are two main positions for adverbs in a sentence.
Subject + adverb + verb
For example:
- I always
fasten my seatbelt in the car. - I sometimes
sing while cleaning the house. - She hardly
visits me.
Subject + be + adverb
For example:
- She is never
happy. - They are always
on time. - He is sometimes
funny.
At the beginning of a sentence
There are some adverbs of frequency that you can use at the beginning of a sentence with a comma.
For example:
- Occasionally,
I go to the park. - Normally,
I don’t study for exams.
However, you can’t use the following adverbs of frequency at the beginning of a sentence:
- Always
- Ever
- Hardly
- Never
- Rarely
- Seldom
Adverbs of Definite Frequency
Adverbs of definite frequency allow us to be more specific when talking about frequency.
Number
Number + Times + a + Time Period
For example:
- Once a day
- Twice a day
- Three times a day
- Four times a day
- Five times a week
- Six times a month
- Seven times a year
Time Period
For example:
- Daily
- Weekly
- Monthly
- Annually
Every
Every + Number + Time Period
For example:
- Every two days
- Every three days
- Every four days
- Every five weeks
- Every six months
- Every seven years
Every + Time Period
- Every day
- Every week
- Every month
- Every year
- Every decade
Practice Exercises
Conclusion
How did you do? If some questions were tricky a private lesson can help you master this topic quickly.

References
