Who , What or Which
A. What or which?
We can use what or which before a noun.
What sport do you play?
What books do you read?
Which way do we go here?
Which finger did you break?
We use what when there is a wide choice of We use which when there is a limited number of possible answers.
We ask What sport? because possible answers.
We ask Which way? because there are lots of different sports. there are only two or three ways to go.
What sport? Which way? (Tennis or golf or football or hockey or … ?) (Right or left?)
After which we sometimes say the possible answers.
Which cafe did you go to, Snoopy’s, the Coffee Pot or the Tea Gardens?
Which phone shall I use, this one or the one in the office?
Sometimes what and which are both possible.
What day/Which day is your evening class?
What train/Which train will you catch?
What platform/Which platform does the train go from?
What part/Which part of Italy are you from?
B. Patterns with who, what and which
We can use who, what and which without a noun.
Who sent the fax?
What do you think of our plan?
Which is quicker, the bus or the train?
We can use what and which before a noun, but not who.
Which secretary sent the fax?
NOT Who-secretary-sent the-fax?
We can use which with one or ones, or with of.
You can have a photo. Which one would you like?
You can have some of the photos. Which ones would you like?
Which of these photos would you like?
But we cannot use who or what before of.
Which of the secretaries?
but NOT Who-of the secretaries?
Who always means a person.
Who did you see? (a person) What usually means a thing.
It can mean a person only when it comes before a noun.
What did you see? (a thing) What doctor/What film did you see? (a person or a thing) Which can mean a person or a thing. Which doctor/film did you see? (a person or a thing)