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which theory vs what theory

Both 'which theory' and 'what theory' are correct, but they are used in different contexts. 'Which theory' is used when there is a specific set of theories to choose from, while 'what theory' is more general and can be used when the theories are not predefined.

Last updated: March 28, 2024 • 679 views

which theory

This phrase is correct and commonly used in English.

Use 'which theory' when you are referring to a specific set of theories and you want to know which one is being referred to.

Examples:

  • Which theory did you find most convincing?
  • I'm not sure which theory to believe in.
  • Can you tell me which theory you are referring to?

Alternatives:

  • which hypothesis
  • which concept
  • which idea
  • which explanation
  • which model

what theory

This phrase is correct and commonly used in English.

Use 'what theory' when you are asking for a general theory or when the theories are not predefined or limited.

Examples:

  • What theory explains this phenomenon?
  • Can you tell me what theory you are working on?
  • I wonder what theory they will propose.

Alternatives:

  • what hypothesis
  • what concept
  • what idea
  • what explanation
  • what model

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