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will, shall, may & might, would, can & could, must, should, ought to
Modal auxiliary verbs help other verbs express a meaning or an idea but have no meaning by themselves. In English, modal auxiliary verbs do not have participle forms (no -ing or -ed endings).
They are used in a variety of grammatical moods such as the conditional mood, which expresses uncertainty ("I would be delighted if you came to my party")