I often go to the cinema with my friends.

The sentence “I often go to the cinema with my friends” is grammatically correct and sounds natural in British English. It means that going to the cinema is a regular activity for you, and you usually do it together with your friends.

A few useful notes:

• “often” is correctly placed before the main verb “go”.

• “go to the cinema” is a very common expression, especially in British English.

• In American English, people more often say “go to the movies” instead of “go to the cinema.”

So you could also say:

• I often go to the movies with my friends. — more natural in American English.

• I usually go to the cinema with my friends. — also correct, with a very similar meaning.

• My friends and I often go to the cinema. — a slightly different structure, but also very natural.

If the goal is simply to express a habit, your original sentence is clear, correct, and completely natural.