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Cat desk Posted 7 years ago
Grammar

"What" vs "which"

What or which : which one should be used?
  • What/which medicine is good for boosting immunity of children?
  • What/which is the longest river in the world?
I think both are correct. But not sure.
  

Top answer

'What' is used for things. 'Which' is used for people.

  • 'What' is used for things.
  • 'Which' is used for people.
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2 Answers
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'What' is used for things. 'Which' is used for people.

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'which' selects; 'what' identifies.

So if you have a small number of choices, most likely even enumerated in the context, 'which' works better, and if you can choose from an enormous number of choices, 'what' is better.

— You can take aspirin or ibuprofen for your headache.
Which is better? (You have selected one of the choices.)

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