写一篇关于朋友的英语作文，你可以遵循以下步骤和结构：

开头

引入主题，例如：“I have a good friend.”（我有一个好朋友。）

描述朋友的外貌特征

例如：“She has two black eyes, her hair is not so long, she is not tall and not short.”（她有一双黑眼睛，头发不是很长，她不高也不矮。）

介绍朋友的性格和兴趣

例如：“She is very kind and always ready to help others.”（她非常善良，总是乐于助人。）

“Her favorite subject is math and English.”（她最喜欢的科目是数学和英语。）

分享一些有趣的故事或经历

例如：“One day, we went to the park and played basketball together.”（有一天，我们一起去公园打篮球了。）

表达你对朋友的感情

例如：“I like her very much and I am glad to have her as my friend.”（我非常爱她，很庆幸有她这样的朋友。）

结尾

总结全文，例如：“She is not only a good friend but also a good student.”（她不仅是一个好朋友，也是一个好学生。）

Title: My Best Friend

I have a best friend. Her name is Mei. She is a girl of 12 years old. She has two big eyes and her hair is long. She is tall and thin. Mei is very smart and she loves reading books. Her favorite subjects are English and science. She is good at speaking English and she often helps me with my English.

One day, I went to her house and we played games together. She is very funny and we laughed a lot. I like her very much and I am glad to have her as my best friend.

In conclusion, Mei is not only a good friend but also a good student. I hope our friendship will last forever.

希望这个例子能帮助你写出一篇关于朋友的英语作文。如果有任何需要修改或添加的地方，请随时告诉我。