The modal verbs in the provided quiz are:
Must: Indicates a strong obligation or necessity. It implies that the action is required.
Should: Suggests a recommendation or advice. It is used to express what is considered the right thing to do.
Have to: Signifies a general obligation or requirement. It implies that there is a necessity to perform the action.
Must not (Mustn't): Indicates prohibition or a strong obligation not to do something. It expresses the idea of being forbidden.
Should not (Shouldn't): Meaning: Conveys a negative recommendation, advising against a specific action.
Don't have to (Do not have to): Implies the absence of obligation. It means there is no requirement to perform the action, but it is optional.
Modal verbs, also known as modal auxiliary verbs or simply modal verbs, are a category of auxiliary verbs used to express the attitude, necessity, possibility, permission, ability, or likelihood of an action or situation.