The document discusses different modal auxiliary verbs in English and their uses. It lists modal verbs such as should, may, might, can, could, must, will, and would. For each verb, it provides the formula, examples, and an explanation of how the verb is used - such as to give advice, express possibility, permission, ability, obligation, certainty, or polite requests. The document serves as a reference for the proper uses of various modal auxiliary verbs in the English language.