Dear XX,
As a person who has been familiar with this subject, I am writing the letter to you to recommend one of my best friends, Helen Wang, for this post. On account of her outstanding professional achievement and cheerful personalty, I harbour the idea that she is qualified for this.
First of all, she was elected chairperson of the Student Union several times with unparalleled leadership and infectious verbal expression. Second, busy as she was, she fully completed his major, teenage psychology, with an outstanding school record of XX. Upon graduation she was assigned to be a teacher in Fudan Middle School. What’s more, she loves his job and enjoys working with children, which has won her great popularity among his students.
Therefore, I do not hesitate to recommend her as an ideal candidate for the post you advertised. I am sure you will make a wise decision in hiring her.