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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 ...
The verb read /ɹiːd/ has the same spelling in all three forms, but not the same pronunciation for the past tense and past participle /ɹɛd/, as it exhibits vowel shortening. In a few cases the past tense of an irregular verb has the same form as the infinitive of a different verb.
(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 most straightforward type of regular verb conjugation pattern involves a single class of verbs, a single principal part (the root or one particular conjugated form), and a set of exact rules which produce, from that principal part, each of the remaining forms in the verb's paradigm.
Many English verbs exhibit subject agreement of the following sort: whereas I go, you go, we go, they go are all grammatical in standard English, he go is not (except in the subjunctive, as "They requested that he go with them"). Instead, a special form of the verb to go has to be used to produce he goes.
A regular English verb has only one principal part, from which all the forms of the verb can be derived.This is the base form or dictionary form.For example, from the base form exist, all the inflected forms of the verb (exist, exists, existed, existing) can be predictably derived.
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).
As regards English, there are many verb forms and constructions which combine time reference with continuous and/or perfect aspect, and with indicative, subjunctive or conditional mood. Particularly in some English language teaching materials, some or all of these forms can be referred to simply as tenses (see below).