Some short and true sentences thanking teachers for their hard work are as follows:

1. Thank you for your hard work. Your teaching has benefited us a lot and is a guide to our growth.

2. Teacher, you have worked hard! Your patient teaching makes us make continuous progress in our study and is the most important guide in our life.

3. Thank the teacher for teaching us tirelessly. Your contribution is the cornerstone of our growth and the beacon of our future road.

Teacher, you are our role model. Your teaching keeps us growing. Thank you for your selfless dedication and hard work.

Thank you for working hard for us. Your teaching gives us more confidence and courage to face the challenges in the future.