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"when did this happen" vs "when did it happen"

Both phrases are correct, but they are used in slightly different contexts. 'When did this happen?' is used when referring to a specific event or situation that is currently being discussed or is known to both the speaker and the listener. 'When did it happen?' is more general and can be used when the event or situation is not explicitly mentioned or known.

Last Updated: March 15, 2024

when did this happen

This phrase is correct and commonly used in English.

This phrase is used when referring to a specific event or situation that is currently being discussed or is known to both the speaker and the listener.

Examples:

  • When did this happen? I don't remember hearing about it before.
  • When did this happen? Can you give me more details?

when did it happen

This phrase is correct and commonly used in English.

This phrase is more general and can be used when the event or situation is not explicitly mentioned or known.

Examples:

  • I heard about the accident. When did it happen?
  • When did it happen? I'm not sure of the exact date.

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