Letters - Formal and InformalOnline version Decide which phrases can be used in a formal letter and which in an informal letter. by Ana Bettio 1 Openings - Informal 2 Openings - Formal 3 Closings - Informal 4 Closings - Formal Dear Anna, How are you? Thanks for your letter. It was great to hear from you. Dear Madam, I was very grateful to receive your letter. I am writing in reply to... Hope to hear from you soon. Thanks for everything. Let me know if you want to stay. Bye, Take care, I hope to hear from you in the near future. Yours sincerely,