A simple yet powerful tool, these letters can express gratitude, boost morale, and improve job satisfaction. Learn how to write an employee appreciation letter with these templates and examples.Download the template for free (PDF or Word). Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. In this article, we offer some tips and examples to help you write a great thankyou letter to your manager. I appreciate your hard work, especially in challenging moments. I'm so grateful I get to learn from you all. See below for ideas and thoughtstarters on what to write in a thankyou card. Of course, feel free to tailor your card to suit any occasion. I appreciate your hard work, especially in challenging moments.