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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 • 20628 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 [+]
Last updated: November 06, 2024

Dec 13, 2023 ... I am not sure what has happened but I have reopened a saved file and now my Audacity has the playback and recording meters missing on the ...
Dec 23, 2020 ... I am not sure what has happened but when I create a trey ceiling my vertical sides of the depth that I have called out are not showing.
May 5, 2022 ... I am not sure what has happened but in the last couple of months I have really struggled to get anything reliable/ consistent. There would ...
Jul 13, 2021 ... Yesterday it was working completely fine so I am not sure what has happened. Adrian_02 July 13, 2021, 3:45pm 2. Hey drunkaussie,. I'll need to ...
Mar 27, 2012 ... I am not sure what has happened, I just want to share this with you all and hope that somebody else can relate and let me know they have ...
Jul 17, 2024 ... Hi there I am not sure what has happened, but my walls went transparent all of the sudden. It is worse when looking form outside-in but also ...
Jan 30, 2023 ... I am not sure what has happened but something has changed. I am running the filament that came with it so I don't think that is the problem ...
Jun 23, 2024 ... I am not sure what has happened. I have Microsoft 365 for Mac. It has changed but I do not believe I am on the new Outlook. I used to click ...
Jul 20, 2019 ... I am not sure what has happened but we have had a really good week on Amazon then overnight and today no sales at all. I did notice however ...
Aug 16, 2022 ... I am not sure what has happened, I no longer get the notice to enter into Bios when starting my Windows 10 PC. Perhaps you've done a Bios update ...

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 [+]
Last updated: November 06, 2024

May 31, 2022 ... boopitybeepboopbop. ADMIN MOD. Join. Options. Report. I am not sure what happened here, but this loading tip was helpful. This video cannot be ...
Jul 30, 2024 ... 33K likes, 1681 comments - drjengunter on July 30, 2024: "I am not sure what happened to the caption but I think everyone figured it out!
Jul 13, 2024 ... I am not sure what happened yesterday but around 3-4pm I had to drive to an appointment and my CT wouldn't recognize me, so I couldn't open ...
Feb 9, 2023 ... I am not sure what happened, but the “send” and “cancel” buttons were missing for the last three weeks. Thankfully it is resolved now. Thank ...
Oct 2, 2024 ... 133 I am not sure what happened to the month of September. I missed posting a few sweet new visitors. Maybe because it was the second ...
now, i am not sure what happened. if the codes are bad, why did it work without any issue when flashing and connecting by Jtag? (see attachment). can you ...
Sep 21, 2021 ... I was working on my smartsheet this morning and I am not sure what happened, a cross-sheet reference was added (I did not intend to do ...
i am not sure what happened but i used to be able to click on the green arrow to preview my results. now this has stopped working. every time i click.
Jun 14, 2020 ... So I am not sure what happened. I had over 100 bookmarks and no, i did not manually create any backup. Any help to get my bookmarks back ...
Jun 23, 2022 ... inductiveautomation.perspective\page-config\config.json) reverted to no pages configured. I am not sure what happened or when it happened ...

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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