who后面加know和knows都有通顺的句子么?比如who代表几个人之类的,能这样理解么

一般来说,疑问词who的后面只能用三单形式,即用knows；如果是定语从句引导词,那么who后有可能使用两种形式.如：Who knows where Tom is?This is the man who knows everything about the matter.These are the students who know how to work out this problem.Happy New Year to you!