1) Modals are helping verbs such as can, will, must, ought to, may, might, would, could, should and shall. They are used with another verb and cannot work alone. 2) Different modals express different meanings such as ability, possibility, necessity, lack of necessity, prohibition, and advisability. For example, may, can and could express permission or possibility, must, have to and have got to express necessity, and should and ought to express advisability. 3) The document provides examples of sentences using different modals like may I, could I, must not, don't have to, and shouldn't to demonstrate their meanings and uses. It also includes an agreement