Hi, what's up? You look a bit worry. Yeah, tomorrow is my mother's birthday. I want to write her. I thank you letter. Oh, I have written a thank you letter for my mother before. Can I help you? I have worked on the letter for days, but I still don't know how to express my things. Well, I think details . are important. Yeah, my mom has always been supportive and caring to me. I am very grateful for many things he has done for me. You can also add a few lines to show how you care about her. Thank you so much for your advice. You are welcome.