Question

how to write a thank-you note to someone who has helped you with a difficult task ​

Answer 1

Thank you for helping me with this difficult task. I have been trying to do it on my own but you helped me in doing it with the precious time of yours. I really appreciate your help and i will surely acknowledge using your time by implying this value  in my life. Thanks a lot once again and I will also help you in completing any task if i am worth it.

Hope this helps!