Grammar Point modal verbs modal verbs. Must, as a modal verb, is commonly used for expressing obligation, certainty or necessity and it is followed by the base form of a verb in positive sentences, e.g.. She . Modal verbs are auxiliary verbs (also called helping verbs) like can, will, could, shall, must, would, might, and should.After a modal verb, the root form of a verb is generally used. Must (modal verb) Modal verbs in general are used for expressing a way (mode) actions are done. Modal verbs have only one form. We include have to here for convenience.. Must is a modal auxiliary verb.. ; 2. Most modal verbs, except for ought, are followed by the verb without to. Let’s look at all its meanings here, so you can avoid misunder standings! EnglishClub: Learn English: Grammar: Verbs: Modals: have to, must have to, must. Grammatical behavior of modal verbs. I think the only modal verb that is followed by an infinitive (to+V) is ought. a helmet when she rides a motorcycle. wear. – None Oct 9 '14 at 7:36. Modal Verbs. Modal verbs: can, must, mustn't, should, have to Students match the rules from the grammar guide with pictures and sentences; they then do a multiple choice exercise and finish with a gap filling exercise based on pictures. must. They show ability, possibility, obligation, and permission. Modal verbs are a type of auxiliary verb. Grammatically, modal verbs behave in a different way from ordinary verbs. The word to should not appear after a modal verb. You can only use them with the present tense. Example 1: In this lesson we look at have to, must and must not, followed by a quiz to check your understanding.. have to for objective obligation To express obligation or duty. I must memorize all of these rules about modal verbs. ; You must give up smoking, it's bad for you. Do not conjugate the verb after a modal verb into a specific form. Must must be followed by a main verb in the base form (so must be). 1. Modal verbs are types of auxiliary verbs which express necessity, ability, permission or possibility. Meaning 1: We use MUST when we want to say that it is necessary or very important that something happens in the present or future. must / must not . Examples of modal verbs are can, could, may, must, should, and would. The modal verbs are can, could, may, might, must, ought to, shall, should, will and would. ; You must wear a seatbelt at all times. Dare, need, have to and used to also share some of the features of modal verbs. She might s go to class. Modal verbs don't have a past form (except can) and a past participle (3 rd form). An exception is the phrase ought to, which is considered a modal verb. They have no -s in the third person singular (he, she, it). 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