What is a major difference between the format of a formal letter and the format of an informal letter?
1
The formal letter is written for official purpose, while the informal letter is written for unofficial purpose.
2
The formal letter has official language, while the informal letter has unofficial language.
3
The formal letter has sender's address while the informal letter do not have the sender's address.
4
The formal letter has a subject, while the informal letter does not have a subject.