Dare, need, have to and used to also share some of the features of modal verbs. 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. MUST. Modal verbs have only one form. Have to is NOT an auxiliary verb (it uses the verb have as a main verb). Must (modal verb) Modal verbs in general are used for expressing a way (mode) actions are done. I think the only modal verb that is followed by an infinitive (to+V) is ought. 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 / must not . Must must be followed by a main verb in the base form (so must be). Modal verbs don't have a past form (except can) and a past participle (3 rd form). You can only use them with the present tense. Humans must have drinking water at least every two days. ; People must remain seated until the show is over. Modal verbs are types of auxiliary verbs which express necessity, ability, permission or possibility. To express obligation or duty. – None Oct 9 '14 at 7:36. 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. ; You must wear a seatbelt at all times. Most modal verbs, except for ought, are followed by the verb without to. The modal verbs are can, could, may, might, must, ought to, shall, should, will and would. EnglishClub: Learn English: Grammar: Verbs: Modals: have to, must have to, must. To emphasize the necessity of something. ; 2. Modal verbs are a type of auxiliary verb. We also use them to make requests and offers. Examples of modal verbs are can, could, may, must, should, and would. ; You must give up smoking, it's bad for you. This also refers to laws and regulations. An exception is the phrase ought to, which is considered a modal verb. Grammar Point modal verbs modal verbs. Do not conjugate the verb after a modal verb into a specific form. How To Use MUST MUST is a modal verb – in other words, it helps give meaning to other verbs. I must memorize all of these rules about modal verbs. Let’s look at all its meanings here, so you can avoid misunder standings! 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 They have no -s in the third person singular (he, she, it). wear. a helmet when she rides a motorcycle. I must work hard on my English! They show ability, possibility, obligation, and permission. Grammatical behavior of modal verbs. May, Might and Must are modal verbs that cause confusion for some learners. Example 1: Examples: 1. We include have to here for convenience.. Must is a modal auxiliary verb.. 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