Don't respond to any emails requesting personal information.为什么用requesting不用asking?区别是?How different life today is from what was fifty years ago!为什么用how...life...而不用What a...life...,区别是?

Don't respond to any emails requesting personal information.为什么用requesting不用asking?区别是?
How different life today is from what was fifty years ago!为什么用how...life...而不用What a...life...,区别是?

requesting=== asking for