How To Write A Letter Asking For Extension . Be sure to show your professor that you aren't asking for an extension simply because you ran out of time. Cite the existing rules and make sure you are working with it. Sample Letter To Lawyer Requesting Documents For Your Needs Letter from simpleartifact.com Please note, the context of who you are asking an extension from is always very important! The reason should be genuine and considerable. This drastic loss took a lot of my mental peace and time.