1）我生活中最难忘的老师是……
2）为什么他（或她）令我难以忘怀，
3）结论。
【范文】
In my life I have met a great many teachers who are really worth recalling. But perhaps the most unforgettable one I ever know is my English teacher.
What frequently brings back memories of my school teacher is his special qualities. First of all, he gave us the greatest gift a teacher can offer—an awakening of a passion for learning. He not only led us to an appreciation of the beauty and perfection of English language and literature, but also aroused our great interest in exploring something deeper in this field. Second, I was attracted by his lively wit. I remember that we students always anticipated his class with great eagerness because his lecture were humorously delivered, never failing to provoke chuckles or loud laughs.
Although it is nearly two years since I attended his last class, he is the talk of our old classmates, and I know part of him has already stayed in my heart.
