When do English modal verbs use be?

First of all, verbs can be divided into notional verbs, auxiliary verbs, auxiliary verbs and modal verbs. The notional verbs are divided into transitive verbs and intransitive verbs, both of which have practical significance and can be used as predicates independently. The difference is that transitive verbs can be followed by objects directly (for example, English can be followed by students), and intransitive verbs cannot be followed by objects directly, but they should be used with prepositions to form prepositional phrases (for example, listen must be followed by the preposition "to" to keep up with the object). Verbs with real meaning account for the vast majority of English verbs. A copula is used as a predicate verb in a sentence, followed by a predicate. Commonly used copula verbs are be, seem, look, become, get, grow, feel, apparent, remain, turn, etc. Auxiliary verbs can only form tense, voice, mood and other verb forms with active words. For example, do, should, will, have, have waited. Modal verbs express the speaker's mood or modality, such as ability, obligation, necessity, guess, etc. Common modal verbs are can/may/must/need/rough to/dare, etc. Modal verbs cannot be predicated alone, but must be predicated with other notional verbs. For example, the modal verb "must" in the sentence "You must go to school now" must be predicated with the notional verb "go". It can be seen that the be verb is actually a verb, often followed by a slogan, and the predicates are mostly adjectives (phrases) or nouns (phrases).