I often shop there.
I often have a glass of milk before bed.
How often do you wash your hair?
I don't see him very often.
It's not often you meet someone who you immediately like.
I don't see my parents as often as I'd like to.
We often [go] swimming together. (Skills for Life (Entry 1); A1; Polish)
Brothers and sisters often argue.
Headaches are often caused by stress.
It often rains in April.
Very often, people link classical music to Austrian or German [composers], [such] as Mozart or Handel, but rarely to England and genius[es] [such] as Haydn and Purcell. (First Certificate in English; B2; French)
He went into town every so often to buy supplies.
And likewise, common sense tells us it doesn't matter that oranges from Spain contain 0.01% more vitamin C than those from Florid[a], as long as we eat them every once in a while. (Certificate of Proficiency in English; C2; Dutch)