忘不掉他用英语怎么说

"Cannot forget him" 可以用 "I can't forget him" 或 "He's always on my mind" 来表达。这个短语源自英语中的常见表达方式，表示对某人的思念和难以忘怀。

例句1:
I can't forget him, no matter how hard I try.
（我无论如何也忘不了他。）

例句2:
He's always on my mind, I can't forget him.
（他一直在我心里，我忘不了他。）

例句3:
I can't get over him, I just can't forget him.
（我忘不了他，我就是忘不了他。）