Hypothetical mood
Encyclopedia
Hypothetical mood is an epistemic
Epistemic modality
Epistemic modality is a sub-type of linguistic modality that deals with a speaker's evaluation/judgment of, degree of confidence in, or belief of the knowledge upon which a proposition is based. In other words, epistemic modality refers to the way speakers communicate their doubts, certainties, and...

 grammatical mood
Grammatical mood
In linguistics, grammatical mood is a grammatical feature of verbs, used to signal modality. That is, it is the use of verbal inflections that allow speakers to express their attitude toward what they are saying...

found in some languages, which indicates that while a statement is not actually true, it could easily have been. For instance, in English, "You know you shouldn't play with knives! You could have hurt someone!"
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