"（这是我儿子亲手写的感谢信，在於老师的帮助下他的英语水平有了长足的进步，从原来地完全无法读进去任何一个字母到现在已经能够自己写简单的英语文章，可以说这是和於老师的教导分不开的。这是他的一点心意，望於老师笑纳） Dear Mr. Yu It has been a long time since our last meeting, but I still cannot forget what you have taught me. Your words boosted my passion for broading my vision in the learning of English, and your description of the learning strategy really gave me a renewed understanding of this subject. Now with your instruction and my hardworking, my grade for the English classes has a considerable rising. And because of my good grade, I have become more confident in class and in front of my teachers. Now I am planning to extend my learning English to a new level which is beyond our curriculum, and I have heard that the college in which Mr. Yu is pursuing a degree has many foreign professors. I am also interested in mathematics and computers, could you please discuss some more professional issue with me in English or could you please offer me some chance to communicate with foreign friends, so that I could get improved in my oral English? I would like to express my strong gratitude to Mr. Yu again and I wish you a good college life! Sincerely, Yong"

"在於老师的耐心教导之下，孩子的数学从班级里吊车尾的成绩直接进入了年级前列，同学们都不敢相信孩子变化之大，老师都好奇地咨询孩子是什么让他进步如此之大，真是太感谢於老师了，在他的辅导之下，孩子放弃了以前不继续学业的想法，最近准备直接跳过高中，和於老师一起到交大密西根学院学习，希望能成为他的同学!"