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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 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.
In this case the number is marked overtly on the noun, and is also reflected by verb agreement. However: The sheep can run. In this case the number of the noun (or of the verb) is not manifested at all in the surface form of the sentence, and thus ambiguity is introduced (at least, when the sentence is viewed in isolation).
The above two forms can be combined, to indicate a present or past view of a prior (or prior and current) event that occurred with stative or progressive aspect ("I have/had been feeling well," "I have/had been taking classes"); here the construction is "have/has/had" + "been" + main verb + -"ing".
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.
English is unusually lax by comparison with other Indo-European languages in its rules on transitivity; what may appear to be a transitive verb can be used as an intransitive verb, and vice versa. Eat and read and many other verbs can be used either transitively or intransitively.
In the present tense (indicative mood), the following verbs have irregular conjugations for the third-person singular: to have: has; to do: does; to say: says; Note that there is a distinction between irregular verb conjugations in the spoken language and irregular spellings of words in the written language.
No marker of a distinct future tense exists on the verb in English; the futurity of an event may be expressed through the use of the auxiliary verbs "will" and "shall", by a non-past form plus an adverb, as in "tomorrow we go to New York City", or by some other means. Past is distinguished from non-past, in contrast, with internal modifications ...