Задание 1,Writing Skills, 7e .Spotlight, 11 класс, Английский язык,О.В. Афанасьева,ГДЗ

Помогите сделать пожалуйста:
Look at the types of letters/emails (A-G) below.
Who is each one written to? Which are formal?
Why?
A a letter of complaint to a course director
В an email accepting your friend’s invitation to
a barbecue
C a thank-you letter to your aunt
D an email to a hotel owner asking for the
return of some lost property
E a letter to your friend telling her about a
recent job interview you had
F an email requesting information about an event
G a letter making arrangements for a visiting
speaker to come to a school