couldn't help laughing
彼女はそのドレスを見たときどうにも笑わずにはいられなかった。
She simply couldn’t help laughing when she saw that dress.
I couldn't help laughing when I heard his joke.
We couldn't help laughing when we heard his story.
Tom couldn't help laughing.
I couldn't help laughing.
When I heard that story, I couldn't help laughing.
I couldn't help laughing when I saw the sight.