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Verb tenses are inflectional forms which can be used to express that something occurs in the past, present, or future. [1] In English, the only tenses are past and non-past, though the term "future" is sometimes applied to periphrastic constructions involving modals such as will and go.
In Latin, most verbs have four principal parts.For example, the verb for "to carry" is given as portō – portāre – portāvī – portātum, where portō is the first-person singular present active indicative ("I carry"), portāre is the present active infinitive ("to carry"), portāvī is the first-person singular perfect active indicative ("I carried"), and portātum is the neuter supine.
With some verbs expressing a present state, particularly the copula be and verbs expressing a mental state, the present simple is generally used: They are here; I know that. However other state verbs use the present progressive or present simple depending on whether the state is considered temporary or permanent: The pen is lying on the table ...
The simple present, present simple or present indefinite is one of the verb forms associated with the present tense in modern English. It is commonly referred to as a tense, although it also encodes certain information about aspect in addition to the present time. The simple present is the most commonly used verb form in English, accounting for ...
A verb that does not follow all of the standard conjugation patterns of the language is said to be an irregular verb. The system of all conjugated variants of a particular verb or class of verbs is called a verb paradigm; this may be presented in the form of a conjugation table.
The non-past verb forms are conjugated by person/number, while the past verb forms are conjugated by gender/number. The present tense is indicated with the non-past imperfective form. The future in the perfective aspect is expressed by applying the conjugation of the present form to the perfective version of the verb.
The present indicative of most verbs in modern English has the same form as the infinitive, except for the third-person singular form, which takes the ending -[e]s. The verb be has the forms am, is, are. For details, see English verbs. For the present subjunctive, see English subjunctive.
Apart from the modal verbs, which are irregular in that they do not take an -s in the third person (see above), the only verbs with irregular present tense forms are be, do, have, say and an archaic verb wit (and prefixed forms of these, such as undo and gainsay, which conjugate in the same way as the basic forms).