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he must have forgotten vs he might have forgotten

Both phrases are correct, but they convey different levels of certainty. 'He must have forgotten' implies a high level of certainty that he forgot something. 'He might have forgotten' suggests a possibility that he forgot, but the tone is less certain.
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Explained by Jennifer
Editor at TextRanch

Last updated: February 19, 2025 • 6183 views

This phrase is correct and commonly used in English to express a high level of certainty that someone forgot something.

"he must have forgotten"

This phrase is used when you are very sure that the person forgot something. It indicates a strong belief or conclusion.

Examples:

  • He must have forgotten his keys because they are not in his pocket.
  • She must have forgotten about the meeting because she didn't show up.
  • They must have forgotten to lock the door because it was open when we got home.
  • Jul 5, 2024 ... I mean he must have forgotten #reels #hubby #31weekspregnant.
  • High quality example sentences with “he must have forgotten” in context from reliable sources - Ludwig: your English writing platform.
  • Mar 24, 2015 ... Was questing in Old (TBC) Nagrand. Garrosh knew something then that he must have forgotten. Image.
  • He... he must have forgotten it. Он... он, должно быть забыл его. You must have forgotten, Alemayehu, I was also brought up here. Ты должно быть забыл ...
  • Feb 15, 2023 ... He must have forgotten.
  • Mar 15, 2019 ... ... He must have forgotten. . .”) explains the first clause. He's never ... he must have forgotten we were meeting today'? All related (34).
  • Apr 3, 2017 ... He must have forgotten that, too. Our waitress wasn't the most personable either — it was like we were bothering her. In fact, she took our ...
  • Oct 29, 2009 ... But he must have forgotten. And my father made a spectacular recovery. One month later, he drove 90 miles to show me his new Toyota RAV4 ...
  • Apr 27, 2024 ... 74K likes, 1341 comments - txreemarie on April 27, 2024: "He must have forgotten that I've always got oil in the pantry.

Alternatives:

  • He definitely forgot
  • He certainly forgot
  • He undoubtedly forgot
  • He for sure forgot
  • He absolutely forgot

This phrase is correct and commonly used in English to express a possibility that someone forgot something, but with less certainty.

"he might have forgotten"

This phrase is used when you are suggesting a potential scenario where the person forgot something, but you are not completely sure.

Examples:

  • He might have forgotten his umbrella, that's why he got wet in the rain.
  • She might have forgotten her homework, which is why she's not prepared for class.
  • They might have forgotten to buy milk, so there's none in the fridge.

Alternatives:

  • He could have forgotten
  • He may have forgotten
  • He possibly forgot
  • He likely forgot
  • He probably forgot

Related Comparisons

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