must have done something vs might have done something

Both phrases are correct, but they convey different levels of certainty. 'Must have done something' indicates a high level of certainty that an action was completed in the past, while 'might have done something' suggests a possibility or likelihood of an action occurring. The choice between the two depends on the degree of certainty you want to express.

Last updated: March 17, 2024 • 1872 views

must have done something

This phrase is correct and commonly used in English to express a high level of certainty about a past action.

This phrase is used to indicate a strong belief or certainty that an action was completed in the past. It implies that the action almost certainly happened.

Examples:

He must have taken the wrong turn because he's late.
She must have forgotten her keys at home.

Show examples from the web [+]

"Must Have Done Something Right". [Verse 1] We should get jerseys cause we make a good team. But yours would look better than mine, cause you're outta my ...
Jul 27, 2009 ... Relient K - Must Have Done Something Right ( With Lyrics) ..... Must have done something wrong since you left me and didn't tell me why :,(.
Nov 6, 2014 ... Must Have Done Something Right. Gotee Records. SubscribeSubscribed Unsubscribe 5,7055K. Loading... Loading... Working... Add to ...
"Must Have Done Something Right" is the lead single from Relient K's fifth album, Five Score and Seven Years Ago. The song was officially released to radio in ...

Alternatives:

definitely did something
certainly did something
undoubtedly did something
surely did something
absolutely did something

might have done something

This phrase is correct and commonly used in English to express a possibility or likelihood of a past action.

This phrase is used to suggest a possibility or likelihood that an action occurred in the past. It indicates less certainty compared to 'must have done something.'

Examples:

She might have left her umbrella in the car.
He might have misunderstood the instructions.

Show examples from the web [+]

This is the British English definition of might have done something. View American English definition of might have done something. Change your default ...
as you might expect/imagine · I might have known/guessed · I might say/add · might...but · might have done something · might (just) as well · might not/might ...
Apr 2, 2012 ... Had she known starting a network is so difficult, she admitted, “I might have done something else.” The segment began with the usual small talk ...
Aug 14, 2015 ... 'I think I might have done something really bad,' says Cleo - after paedophile Pete assaults her. 12:01am, Saturday, 15 August 2015 ...

Alternatives:

could have done something
may have done something
possibly did something
likely did something
probably did something

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must have done something vs might have done something