MATERIAL FOR LEVELS 3-4-7-8

WRITING FORMAL AND INFORMAL LETTER.

https://www.wikihow.com/Write-a-Letter

https://www.eslbuzz.com/how-to-write-a-letter-informal-and-formal-english/

WRITING FORMAL AND INFORMAL E MAIL

https://www.myenglishteacher.eu/blog/formal-and-informal-email-phrases/

https://www.thelanguagegallery.com/blog/tips-and-vocabulary/formal-and-informal-email-phrases-to-learn