speak of,speak about和speak on似都有“谈及……”之意,但在句中它们的实际涵义和用法却略有差异,有时甚至大相径庭,分述如下:一、Speak of(mention,refer to)提到:谈及;可指口头的或文字里的“谈及”,但只是泛泛谈及某事,某物或某人,并不涉及其详情。如: He speak of retiring at the end ofthe year. Speak of, speak about, and speak on seem to all have the meaning of “talk about...” but their actual meaning and usage are slightly different in the sentence, and sometimes they are very different and are described as follows: 1. Speak of (mention, Refer to) refers to: talk; can refer to “talk” in words or in words, but it only refers to something, something, or someone in a general way, and does not involve its details. Such as: He speak of retiring at the end of the year.