can't stop ... ing 不得不做某事

can't 为否定，stop 从内容上也是否定语。因此否定的否定为强烈的肯定，即 can't stop ... ing 表示无法停止，换句话说就是“不得不继续做某事”。

例句：

Ever since you left, I can't stop thinking about you.

自从你离开之后，我无法克制思念的心情。

I can't stop crying.

我只好一直哭下去。

I'm sure you can't stop loving me.

我相信你会一直爱我。

I couldn't stop laughing at your story.

听了你的话，我没办法忍住笑。

对话：

A: Why are you always so sad?

你为什么总是那么悲伤？

B: I can't stop thinking about my ex-boyfriend.

我一直忘不了前男友。