Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions. 'know of' is used when you have personal experience with wha. 2.例句 i don't know the name of the place 我不知道那个地方的名字。 then i saw a gun under the hall table so i knew that something was wrong 后来我看到大厅的桌子下有一把枪，我就意识到有些不对.
Possible duplicate of "know about" vs. Also what are the differences between “know”, “know about”, and “know of”? To know has a very general meaning of knowledge and has had this sense for several millenniums.
It can be traced back through proto germanic * knoeanan to the proto indo european root * gno-.
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