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The preterite and past participle forms of irregular verbs follow certain patterns. These include ending in -t (e.g. build, bend, send), stem changes (whether it is a vowel, such as in sit, win or hold, or a consonant, such as in teach and seek, that changes), or adding the [n] suffix to the past participle form (e.g. drive, show, rise ...
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.
With the exception of the highly irregular verb be, an English verb can have up to five forms: its plain form (or bare infinitive), a third person singular present tense, a past tense (or preterite), a past participle, and the -ing form that serves as both a present participle and gerund.
The verb aller also constructs its past participle and simple past differently, according to the endings for -er verbs. A feature with these verbs is the competition between the SUBJ stem and the 1P stem to control the first and second plural present subjunctive, the imperative and the present participle, in ways that vary from verb to verb.
Excluding four common irregular verbs, the principal parts of all other English verbs are the infinitive, preterite and past participle. All forms of these English verbs can be derived from the three principal parts. Four verbs have an unpredictable 3rd person singular form and the verb "to be" is so irregular it has seven separate forms.
For example, the verb write has the principal parts write (base form), wrote (past), and written (past participle); the remaining inflected forms (writes, writing) are derived regularly from the base form. Some irregular verbs have identical past tense and past participle forms (as the regular verbs do), as with send–sent–sent.
For the past participle alone, the gender and the number. Apart from a few frequent verbs which are considered totally irregular (mainly avoir, être, aller and faire), for each tense of each mood a series of six endings (one for each person singular and plural) is associated with a group or subgroup of verbs. Each of these series must now ...
The past participle (participio pasado or participio pasivo) is regularly formed with one of the suffixes -ado or -ido (-ado for verbs ending in "-ar" and -ido for verbs ending in "-er" or "-ir"; but some verbs have an irregular form ending in -to (e.g. escrito, visto, puesto), or -cho (e.g. dicho, hecho). [32]