"What" is used while asking about things or actions...
What is it?
What did you do?
What is going on?
What are you doing?
What is the biggest country?
"What" is also used in the cases while we are giving reference about something..
I can't understand what you are saying now.
That gift is so beautiful, what you gave me on my birthday.
"Who" is used while asking about a person....
Who did this?
Who came here?
Who are they?
"Who" is also used to give reference about the particular person.
The man, who is standing there is my uncle.
The people, who got good names in their life are lucky.
"Which" is used while we are asking about a particular thing mentioning its features.
Which is the longest river?
Which ring is more beautiful?
Which is the sweetest memory?
"Which" is also used in the cases while we are giving reference about something particularly.
The watch, which is gold in colour is my favourite.
The sun, which is a brightest star is the center of our solar system.
What is it?
What did you do?
What is going on?
What are you doing?
What is the biggest country?
"What" is also used in the cases while we are giving reference about something..
I can't understand what you are saying now.
That gift is so beautiful, what you gave me on my birthday.
"Who" is used while asking about a person....
Who did this?
Who came here?
Who are they?
"Who" is also used to give reference about the particular person.
The man, who is standing there is my uncle.
The people, who got good names in their life are lucky.
"Which" is used while we are asking about a particular thing mentioning its features.
Which is the longest river?
Which ring is more beautiful?
Which is the sweetest memory?
"Which" is also used in the cases while we are giving reference about something particularly.
The watch, which is gold in colour is my favourite.
The sun, which is a brightest star is the center of our solar system.