What are the key features of a letter
Formal:
Usted/ustedes
Both addresses
Date
What are the key features of a diary entry
Date
Informal, tu
Personal, opinionated,
How to open a formal letter?
Muy señor mío/ muy señora mía
Estimado
How to close a formal letter?
Le saluda atentamente
Cordialmente
How to open an informal letter?
Querido