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The right-hand column notes whether the verb is weak or strong and whether it belongs to a subclass, and links to descriptions elsewhere. Information about the development of these verbs generally can be found at English irregular verbs; details of the etymology and usage of specific verbs can be found by consulting Wiktionary.
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For other irregular verbs and their common patterns, see the article on Spanish irregular verbs. The tables include only the "simple" tenses (that is, those formed with a single word), and not the "compound" tenses (those formed with an auxiliary verb plus a non-finite form of the main verb), such as the progressive, perfect, and passive voice.
The verbs haber and tener are easily distinguished, but they may pose a problem for learners of Spanish who speak other Romance languages (where the cognates of haber and tener are used differently), for English speakers (where "have" is used as a verb and as an auxiliary), and others.
Verbs with devoicing of the ending and no other irregularity: burn, dwell, learn, smell, spell, spill and spoil. Most of these have regular -ed forms as alternatives. Verbs continuing the Rückumlaut pattern: bring–brought, buy–bought, seek–sought, sell–sold, teach–taught, tell–told, and think–thought.
Vowel raising appears only in verbs of the third conjugation (-ir verbs), and in this group it affects dormir, morir, podrir (alternative of the more common pudrir) and nearly all verbs which have -e-as their last stem vowel (e.g. sentir, repetir); exceptions include cernir, discernir and concernir (all three diphthongizing, e-ie).
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.
This has happened with the strong verbs (and some groups of weak verbs) in English; patterns such as sing–sang–sung and stand–stood–stood, although they derive from what were more or less regular patterns in older languages, are now peculiar to a single verb or small group of verbs in each case, and are viewed as irregular.