I don't know if you have noticed all this.

我不知道你有没有注意到这些事情。

youdao

I do not know if you have noticed all these things.

我不知道你是否注意到了所有这些事情。

youdao

I wonder if you have noticed how lonely most people are.

我不知道你是否注意过大部分的人有多么寂寞？

youdao

If you have ever visited, you might have noticed the popular license plates on many D.C.cars.

VOA: special.2009.03.20

In Franny and Zooey, what did you notice? Tell me what you noticed, at first bat, if any of you have read it.

在《弗兰尼与佐伊》里，你们注意到了什么，告诉我，首先问一下，你们有谁读了它吗。

耶鲁公开课 - 1945年后的美国小说课程节选

You may have noticed, if you look outside, that the cloud of uncertainty -- (laughter) -- has been lifted over our economy, or almost, anyway.

WHITEHOUSE: Press Briefing

As a result, if you earn a salary, you may have noticed that your first paycheck in 2013 was 2% lighter than your last check in 2012, assuming equal pay.

FORBES: Dear America: Your Higher Payroll Taxes Are Not The Result Of A Tax Increase

Something really momentous just happened, though if you are not a web geek, you may not have noticed.

FORBES: Google And Mozilla Strike The Golden Spike On The Tracks Of The Real Time Web