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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 ...
In some weak verbs ending in a final -t or -d, this final consonant coalesced with the weak past ending to leave a single -t or -d in the past forms. Some verbs ending in l or n had their past ending irregularly devoiced to -t, and in a few verbs ending with a v or z sound (leave, lose), both
The Modern English-ing ending, which is used to form both gerunds and present participles of verbs (i.e. in noun and adjective uses), derives from two different historical suffixes. The gerund (noun) use comes from Middle English-ing, which is from Old English-ing, -ung (suffixes forming nouns from verbs).
The present participle/gerund is formed by adding -ing, again with the application of certain spelling rules similar to those that apply with -ed. The irregular verbs of English are described and listed in the article English irregular verbs (for a more extensive list, see List of English irregular verbs). In the case of these:
However if the base form ends in one of the sibilant sounds (/s/, /z/, /ʃ/, /ʒ/, /tʃ/, /dʒ/) and its spelling does not end in a silent e, then -es is added: buzz → buzzes; catch → catches. Verbs ending in a consonant plus o also typically add -es: veto → vetoes. Verbs ending in a consonant plus y add -es after changing the y to an i ...
Historically, the -ing suffix was attached to a limited number of verbs to form abstract nouns, which were used as the object of verbs such as like. The use was extended in various ways: the suffix became attachable to all verbs; the nouns acquired verb-like characteristics; the range of verbs allowed to introduce the form spread by analogy ...
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.
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 ...