Answer :
informal language is the type of language that is used to communicate between close friends and associates.
Some features of informal language include:
- Usage of casual words
- SImplified or colloquial terms are allowed
- Some rules of grammar may be ignored
Therefore, rewriting the given sentence in an informal language among a close friend would be "Three firemen died when trying to save people from a burning building"
Read more:
https://brainly.com/question/4069564