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Most verbs have three or four inflected forms in addition to the base form: a third-person singular present tense form in -(e)s (writes, botches), a present participle and gerund form in -ing (writing), a past tense (wrote), and – though often identical to the past tense form – a past participle (written).
The base form or plain form of an English verb is not marked by any inflectional ending.. Certain derivational suffixes are frequently used to form verbs, such as -en (sharpen), -ate (formulate), -fy (electrify), and -ise/ize (realise/realize), but verbs with those suffixes are nonetheless considered to be base-form verbs.
(The present participle and gerund forms of verbs, ending in -ing, are always regular. In English, these are used as verbs, adjectives, and nouns.) In the case of modal verbs the present and preterite forms are listed, since these are the only forms that exist with the present form identical for all persons.
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.
In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come ...
The simple past or past simple, sometimes also called the preterite, consists of the bare past tense of the verb (ending in -ed for regular verbs, and formed in various ways for irregular ones, with the following spelling rules for regular verbs: verbs ending in -e add only –d to the end (e.g. live – lived, not *liveed), verbs ending in -y ...