This document summarizes the key modal verbs in English including their meanings and uses. The main modal verbs discussed are can/could, shall/should, may/might, will/would, must, ought to, need, used to, and dare. Can/could express ability or permission. Shall/should indicate commands or obligations. May/might imply permission, possibility, or polite requests. Will/would refer to intentions, willingness, or past habits. Must denotes necessity and ought to conveys moral obligation. Need is used for necessary actions and used to describes past routines. Dare expresses courage or defiance, especially in negatives.