Formal or informalSorry or apologise
Everyday: speech and messages.
Sorry, I'm running ten minutes late!
Formal: emails, letters, speaking to officials.
I apologise for missing the meeting on Monday.
Remember: Sorry for a friend. "I apologise for…" in a leave letter or email. Note the British spelling: apologise.
Short lessonFormal or informalWe speak differently to friends, teachers and officials. This change in style is called register.