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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.
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 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 past can be substituted using the form might have + morphologically altered main verb. could is used in several ways: mild permission or advisability in the present: You could do that. The equivalent past form is could have + morphologically altered main verb (you could have done that).
For example, the English verbs "to know" (the state of knowing) and "to find out" (knowing viewed as a "completed action") correspond to the imperfect and perfect forms of the equivalent verbs in French and Spanish, savoir and saber. This is also true when the sense of verb "to know" is "to know somebody", in this case opposed in aspect to the ...
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.
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.
Many languages, including English, have ditransitive verbs that denote two objects, and some verbs may be ambitransitive in a manner that is either transitive (e.g., "I read the book" or "We won the game") or intransitive (e.g., "I read until bedtime" or "We won") depending on the given context.