“我爱你”用英语可以说成“I love you.”。其中，“I”表示“我”，“love”表示“爱”，“you”表示“你”或“你们”。这句话简洁而直接，是表达深情和爱意时常用的英语用语。

如果你想要用英语写一篇关于“我爱你”的作文，可以参考以下示例：

简单的表达

I love you.

深情的表达

Dear [Name],

I want to take this opportunity to express my deepest feelings for you. You are the light in my life, the one who makes everything brighter and more meaningful. I love you more than words can say, and I am grateful for every moment we share.

With all my heart, I say, I love you.

感谢和回报

Mom, I love you. Thank you for everything you have done for me. I promise to always be there for you and make you proud.

这些表达方式可以根据不同的场合和情感深度进行调整，以满足不同的需求。