Formal or Informal? Writing Informal Letters Writing Formal Letters I thought I'd drop you a line... Why not pop up here to see us? Do keep in touch. Well, I think that's all for now. I've been meaning to write to you for ages. Why don't you come to dinner... I'd love to see you again. Thanks for the invitation. I'm looking forward to... Drop by for coffee some time. I am writing to inquire about... I would appreciate an early reply. I am sorry to inform you that... I am writing in connection with... Please accept our sincere apologies... I am currently working at... I feel I must protest about... Please indicate whether you will be able... Your presence is required at... I look forward to...

Задание

Formal or Informal?