Adverbs of frequency (always, usually, often, sometimes, rarely, never) tell us how often something happens.
These adverbs go:
We can use other expression to talk about frequency such as:
Every day, every week, every morning, every month, or every year.
Once, twice a day, three times a week, four times a year, etc.
A question word to ask about frequency is: How often …?
Examples:
How often do you go to the cinema?
I go to the cinema twice a month.
How often does Katherine go dancing?
She goes dancing every weekend.