Hi Shirley,
Thank your for your letter.I am happy to tell you something about me and my class.
There are 50 students in my class.Thirty of them are girls,the rest are boys.I am very tall in my class,the second tallest one.I study very hard and is one of the most deligent students.My teach often praises me and asks me more difficult questions.I like sports,I can run faster than any other students in my class.I am good at English since I spend most of my spare time learning English.I watch movie to improve my listening ability.I am learning to play basketball with my classmates since they really encourage me to do so.Playing basketball is one of the most popular sports in our class.