What are modal verbs? Modals (also called modal verbs, modal auxiliary verb s, modal auxiliaries are special verbs which behave irregularly in English. They are different from normal verbs like "work, play, visit..." They give additional information about the function of the main verb that follows it. They have a great variety of communicative functions . They also tells us the mood or sentiments of the speaker. We can understand the meaning of the modal by the rising and falling tone of the speaker. Here are some characteristics of modal verbs: They never change their form. You can't add "s", "ed", "ing"... They are always followed by an infinitive without "to" (e.i. the bare infinitive.) They are used to indicate modality allow speakers to express certainty, possibility, willingness, obligation, necessity, ability List of modal verbs Here is a list of modal verbs: can, could, may, m