One possible version :

     I still remember how nervous l was on my first day in the new school three years ago. When I found it

difficult to follow my teacher in the first English class. The teacher spoke English throughout the class, which

was totally different from the lessons I had taken before.

     In the morning class the next day, the English teacher came to me while l was reading the text aloud as

other students. After listening to me for a while, she gave me a big smile and said she liked my voice very

much. The smile shone on the whole day, and the following days. A week later, I volunteered to take charge

of English study in my class.

     Thanks to the comforting smile in my first morning class , I began to be confident.