Two voices in one letter
the slip that breaks the tone
A letter can open politely and drift into chat. The public band descriptors ask for a tone that stays consistent.
Dear Ms Hale, I regret that I am unable to help at the open day on Saturday.formal Sorry, but my daughter's ill so I can't make it. Hope that's OK!suddenly casual Yours sincerely, Dana
Formal, then a friend. The reader hears two writers.