How do you write a request?

How you'd write a request would depend on who you are asking.

If this is an informal "request", a simple note would do fine. For example, "borrowing" an item could be a type of informal request. "Mary, could I borrow your science book?" Or asking your neighbor, "Mark, can I use your lawnmower this weekend?"

A formal request would be used more in business or any transaction that you'd need a written record. For example, a customer can request specific shipment instructions: "Please deliver to back door. Front door has no entry." A union supervisor would want to put union members' requests in writing. An employee might want to request days off.

For business purposes, either put the request in the form of a business letter if you are not within the company, or use a formal memo for internal communication. If the matter is within human services, such as an employee's request for a leave of absence, then use a formal letter.

There are many examples online that give the basic structure for how to write a memo, or how to write a business letter.