关于"My Best Friend"英语作文的结尾句，以下是几种推荐的表达方式，可根据作文整体风格选择使用：

表达深厚情感

- I love her very much.

- I cherish our friendship the most.

- She means the world to me.

总结友谊特质

- She is my confidant and my cheerleader.

- Together, we face every challenge.

- Her presence brightens my life.

展望未来

- I hope to grow old with her.

- Our friendship will last forever.

- I look forward to all the adventures ahead.

建议结尾句与文章主题呼应，若强调友情的珍贵，可选择第一种或第二种表达；若侧重共同经历的回忆，第三种展望未来的句子更合适。