Why are you sorry for something you haven't done? ✬

You haven't changed at all. ✬

You haven't washed your hands yet, have you? ✬

I think I might join you, but I haven't decided yet. ✬

I haven't the faintest idea what you mean. ✬

I haven't slept well recently. ✬

I haven't seen anything of her lately. ✬

I haven't seen him for a long time. ✬

We haven't known each other long. ✬

Are you sure you haven't forgotten anything? ✬