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

Both sentences are correct, but they are written in different tenses. They convey the same meaning and are commonly used in English.

Explained by Vince
Editor at TextRanch

Last updated: September 10, 2024 • 20569 views

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.

Show examples from the web [+]

Aug 22, 2015 ... I am not sure what has happened but over the last few years the Swallows have all but disappeared; there are only a few remaining nests on ...
I am not sure what has happened to personal responsibility and accountability but everyone that is reading this needs to look inside and ask, did I take the wrong ...
Believe me I have been looking. I am not sure what has happened here but I will tell you that I am more anxious about this year then I have ever been in the past.
Jul 16, 2014 ... After a frustrating experience I just had at my local library, I felt obligated to talk about it. I am not sure what has happened to respect, ...

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

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.

Show examples from the web [+]

Aug 11, 2015 ... So I am not sure what happened. They are all still fine on Stitcher and other places, but I need iTunes to be working correctly. My RSS feed is: ...
May 21, 2015 ... I am not sure what happened since the update, but now I have to re-render most of the timeline after I restart, and it's only parts, so it's very ...
Sep 1, 2015 ... I am not sure what happened, so I will explain the best I know. So long time ago I found an old question with outdated answers and decided to ...
I am not sure what happened. I upgraded to 2.8.4 about 2 weeks ago. About two days ago I lost all my tags, categories, links and some sidebar functionality.

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

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