Sad to say, none has done so yet.

遗憾的说，至今为止还没有人这么做过。

I'm sad to say that I lost my way.

我很伤心地说我失去了我的方向。

Sad to say, his days are numbered.

说来令人伤心，他的生命已日薄西山了。

Sad to say, you're finding really good things.

很难过的说，你能找到好东西。

It's not because they like us, sad to say.

很不幸，这并不是因为他们喜欢美国。