What is the primary purpose of a request letter?

To formally ask for something such as permission, information, or assistance.

Why is it important to include the date in the heading of a request letter?

To show when the letter was written.

The recipient's name, title (if applicable), company or organization name (if applicable), and full address (street, city, and zip code).

I can write a formal letter of request using target vocabulary and phrasal verbs in context.

1
The heading of a request letter should include the sender's return address and the date the letter was written.
2
The body of a request letter should include an introduction, details, and a polite conclusion to clearly state the purpose and justification for the request.
3
Common complimentary closes for a request letter include sincerely and best regards, and end notations may include enclosures or carbon copies (CC).