在写关于笔友的英语作文时，可以遵循以下结构和内容来组织文章：

开头

介绍自己笔友的基本信息，如姓名、年龄、国籍和来自哪里。

可以简单描述笔友的外貌或性格特点。

正文

共同兴趣：描述你和笔友共同的兴趣爱好，比如阅读、运动、音乐等。

书信往来：分享你们通过书信交流的内容和感受，可以提及一些有趣的对话或事件。

学习经历：如果笔友在你所在的城市学习，可以描述你们一起学习的经历或互相帮助的情况。

未来计划：提及笔友未来的计划或梦想，以及你们对彼此未来的期待。

结尾

总结你们之间的友谊，表达对笔友的祝福和期待再次相聚的情感。

My Pen Pal

I have a pen pal named Lily. She is a 14-year-old girl from Shanghai, China. She is very talented and speaks English very well. Lily can play the guzheng, a traditional Chinese instrument, which she often plays for me.

We share many common interests. We both love reading and watching movies. She is very good at math, and I often ask her for help with my homework. We also like to write letters to each other, sharing our daily lives and feelings.

Next month, Lily will visit our school to study. I am very excited about it because we will have more time to hang out and explore the city together. I am sure we will have a great time and create many unforgettable memories.

I cherish our friendship very much and look forward to our future visits. I hope we will always stay in touch and continue our wonderful journey of friendship.

通过以上步骤和示例，你可以写出一篇结构清晰、内容丰富的关于笔友的英语作文。记得多使用具体的例子和细节来丰富你的文章，使其更具吸引力和说服力。