This document summarizes the uses and meanings of the modal verbs "must" and "have to". It explains that "must" expresses strong personal obligation or prohibition, while "have to" expresses strong impersonal obligation. It discusses their uses in positive, negative, and interrogative forms. It also covers differences in meaning, such as "must" being used for personal obligations like wishes, while "have to" refers to circumstances, laws, or other people's wishes. Examples are provided to illustrate the appropriate uses of each modal verb in various contexts.