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The verbs do, say and have additionally have irregular third person singular present tense forms (see below). The copular verb be is highly irregular, with the forms be, am, is, are, was, were, been and being. On the other hand, modal verbs (such as can and must) are defective verbs, being used only in a limited number of forms.
The verb be has a larger number of different forms (am, is, are, was, were, etc.), while the modal verbs have a more limited number of forms. Some forms of be and of certain other auxiliary verbs also have contracted forms (' s, 're, 've, etc.). For full details of how these inflected forms of verbs are produced, see English verbs.
Regular verbs have identical past tense and past participle forms in -ed, but there are 100 or so irregular English verbs with different forms (see list). The verbs have, do and say also have irregular third-person present tense forms (has, does /dʌz/, says /sɛz/).
Modern grammars do not differ substantially over membership in the list of auxiliary verbs, though they have refined the concept and, following an idea first put forward by John Ross in 1969, [8] have tended to take the auxiliary verb not as subordinate to a "main verb" (a concept that pedagogical grammars perpetuate), but instead as the head of a verb phrase.
The third person singular present tense is formed regularly, except in the case of the modal verbs (can, shall, etc.) which do not add -s, the verb be (which has three present indicative forms: am, is and are), and the three verbs have, do and say, which produce the forms has, does (pronounced with a short vowel, /dʌz/), and says (pronounced ...
3 Two Word Semi-Modal Auxiliary Verb Phrases. ... This is a list of English auxiliary verbs, i.e. helping verbs, which include Modal verbs and Semi-modal verbs.
Historically, English used to have a similar verbal paradigm. Some historic verb forms are used by Shakespeare as slightly archaic or more formal variants (I do, thou dost, he doth) of the modern forms. Some languages with verbal agreement can leave certain subjects implicit when the subject is fully determined by the verb form.
The English modal auxiliary verbs are a subset of the English auxiliary verbs used mostly to express modality, properties such as possibility and obligation. [a] They can most easily be distinguished from other verbs by their defectiveness (they do not have participles or plain forms [b]) and by their lack of the ending ‑(e)s for the third-person singular.
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