An example of WHO is the organization that is concerned with international public health matters.
Who believes that will believe anything.
An example of who is someone asking the identity of a person; who is that child?
Who is he? I asked who he was; I don't know who he is.
“who steals my purse steals trash”
It was a nice man who helped us.
The visitor who came yesterday; our child, who is gifted; informed sources who denied the story.
Who is that? (direct question)
I don't know who it is. (indirect question)
The man who came to dinner.
- As if one should say.
Idioms and Phrasal Verbs
Origin of who
- Middle English from Old English hwā kwo- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition