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"I am not sure what happened" vs "I am not sure what has happened"

Both phrases are correct and can be used interchangeably. They convey the same meaning and are commonly used in English.

Last Updated: March 17, 2024

I am not sure what happened

This phrase is correct and commonly used in English.

This phrase is used when you are uncertain about a past event and want to express that uncertainty.

Examples:

  • I am not sure what happened, but I heard a loud noise.
  • He is not sure what happened during the meeting.
  • They are not sure what happened to their luggage.

Alternatives:

  • I am not sure what has happened
  • I am unsure about what happened
  • I am uncertain about what happened
  • I don't know what happened
  • I am clueless about what happened

I am not sure what has happened

This phrase is correct and commonly used in English.

This phrase is used when you are uncertain about a past event and want to express that uncertainty.

Examples:

  • I am not sure what has happened, but I will try to find out.
  • She said she is not sure what has happened to the missing keys.
  • We are not sure what has happened to the project deadline.

Alternatives:

  • I am not sure what happened
  • I am unsure about what has happened
  • I am uncertain about what has happened
  • I don't know what has happened
  • I am clueless about what has happened

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