It has been a year since I came back to China, but the exciting and wonderful days in America still stay fresh in my mind (记忆犹新,历历在目). I owe a lot of thanks to you/ I can't thank you enough/ I really be grateful for your kindness during my stay in America/ I really appreciate being kindly treated while in America. Without your kindness and timely (及时的) help, my stay there would have been quite difficult (和过去相反的含蓄条件虚拟语气). It is you that/ who have opened a new world to me and taught me to see the world from different perspectives (视野,角度), and to be grateful to people who once helped me. Never had I known a language could be taught and learned that way, which, up to this day, remains a guide to my English study and an inspiration for my future development.