Modal verbs are the auxiliary verbs that are used along with the infinite form of the verb to convey and express possibility, requests, ability, necessity, and much more. Modal verbs have a lot of applications, like expressing suggestions, talking about the present conditions. It is used in many tenses. These auxiliary verbs are also called conditionals.
References
- https://www.sciencedirect.com/science/article/pii/S0388000105000252
- https://journals.sagepub.com/doi/abs/10.1177/0075424209348151