Term: Epistemic Modality
When a modal verb is used to express the speaker's opinion about a statement, then this is epistemic modality:
It might be true.
Here, the speaker is expressing their attitude about whether it is true or not, accepting that there is a possibility, but not being certain.
See Also: Auxiliary Verb; Deontic Modality; Dynamic Modalilty; Ditransitive Verb; Dynamic Verb; Finite Verb; Inchoative Verb; Intransitive Verb; Irregular Verb; Non-finite Verb; Phrasal Verb; Regular Verb; Stative Verb; Transitive Verb; Verb Group; Verb Phrase