Situation: You recently had a party at your house and your next-door neighbour rang up in the middle to complain about the noise. Write a letter of apology.

Dear Mr and Mrs Smith,

My name is Sean Brown and I am your next-door neighbour. I am writing to apologise to you for disturbing your sleep last night.

My friends from Germany visited me because I had birthday yesterday. They arrived in the evening so the party started very late. I know that we could have listened to the music more quiet but we were dancing and we did not have the sense of time. We did not notice it was the middle of night till you rang me up and complained about the noise.

I am very sorry about the trouble I caused, I assure you that it will never happen again.

Yours sincerely,
Sean Brown