about prep.关于，对于。
(辨析)普通用词，常用于不及物动词之后。
(例证) They sat there and talked about what had happened in the past.
她们坐在那里，谈论着过去发生的事情。
There is nothing to complain about.
没有什么可抱怨的。
concerning prep.〈正式〉关于。
(辨析)多用于正式文体，含有“涉及”的意思。
(例证) The chairman's report is concerning the education of children.
主席的报告是关于儿童教育。
A law concerning food contamination must be made.
必须制定一项关于食品污染的法律。
regarding prep.〈正式〉有关，关于。
(辨析)尤用于信函或演说中。
(例证) Regarding your recent enquiry, I have enclosed a copy of our user guide.
关于您最近的咨询，我随信附上一份我们的用户指南。
I'll make no comments regarding this question.
对于这一问题我不作评论。
respecting prep.〈正式）关于，鉴于。
(辨析)与concerning基本同义，常可换用。
(例证) I have nothing to say respecting/concerning the matter.
关于这件事，我无话可说。
Respecting/concerning the fact that the accused was a minor, the charg-es were dropped.
鉴于被告是未成年人，起诉被撤销。