Contents introduction chapter I. Bases of english language and its stylistic layers

Formal
Informal
They have been fighting all day.	They’ve been fighting all day.
He is very busy. Formal language doesn’t use the first person pronouns.	He’s very busy.
Many different outcomes were planned for the company.	I planned many different outcomes for the company.
Relative clauses must had the relative pronoun whom when using formal language.	We feel that the target is unrealistic.
The famous football team we saw in the airport flew to Europe.	The famous football team whom we saw in the airport flew to Europe.
The secretary whom I talked to yesterday was very rude.	The secretary I talked to yesterday was very rude.

What are the differences between formal and informal reports?
The differences between formal and informal reports include tone, structure, scope, content and purpose. Another difference is that formal reports are often used in academic papers or to provide a lengthy overview of a major change or development within a business, while informal reports are used for shorter documents, such as memos and newsletters. Consequently, formal reports are more detailed than informal reports. 
Formal reports have a set structure: an introduction, body and conclusion. However, informal reports can be structured in any way. Formal reports also have a formal tone and use third-person narrative, while most informal reports use first- or second-person narrative. Although some informal reports use a professional tone, it is not required in many cases.
The scope of informal and formal reports is another major difference. Formal reports analyze a specific topic in great detail. On the other hand, informal reports are often very brief and only include the most relevant information.
Formal reports also provide evidence to back up the information in the report. Since informal reports are brief, this is not included in this type of report. Formal reports usually include citations for the sources used to generate the report. Charts, graphs and statistical information are also common components of formal reports. This information provides evidence and summarizes the findings of the report.