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

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.

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.

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