Perhaps I have not expressed myself very well.

我大概未把自己的意思表达清楚。

《牛津词典》

I have not faltered in my quest for a new future.

我对崭新未来的追求未曾犹豫过。

《柯林斯英汉双解大词典》

I have not entered into any financial agreements with them.

我还没有和他们达成任何财务协议。

《柯林斯英汉双解大词典》

Since I have not been informed that South Carolina declared war on the United States, I can only believe that this hostile act was done without your knowledge or permission.

VOA: special.2009.07.23

It appears to be useful in that way but I imagine it does more compelling things these days but I have not seen it myself.

那样看起来仿佛比较有效果,但我想这些天它非常引人注目,只是我自己没看到而已。

哈佛公开课 - 计算机科学课程节选

No, fortunately for me, I have not actually been any of the people held at gunpoint.

不，我很幸运，我没被人用枪威胁过。

大城市是否危险？ - SpeakingMax英语口语达人

You might notice at this point I have not said much about the rooms or food.

FORBES: Hotels I Love: Machu Picchu Sanctuary Lodge

I've read the excerpts, I've read about it, but I have not read it in full.

WHITEHOUSE: Press Briefing

"I have not grown an ulcer as a result of this job, " he said.

WSJ: Citi's Provocateur in Residence