Irregular verb

In contrast to regular verbs, irregular verbs are those verbs that fall outside the standard patterns of conjugation in the languages in which they occur.

When comparing languages, one measure often brought into play as one of the few quantitative statistics for a language is the number of irregular verbs in that language. These counts are not particularly accurate for a wide variety of reasons, detailed in this article.

What counts as "regular"?

For there to be irregular verbs in a language, obviously there must be regular verbs. English has several regular groups of verbs which are typically predictable (i.e., if one is shown the verb and is told it is not irregular, one can know instantly with perfect accuracy how to conjugate it without the need to have it pre-sorted into a class of verbs).

Classes of verbs in English include:
*Ending in "e": care, cares, cared, caring
*Ending in "o": coo, coos, cooed, cooing
*Ending in "i": ski, skis, skied, skiing
*Ending in "y" as a vowel (i.e., preceded by a consonant): try, tries, tried, trying
*Ending in "y" as a consonant: fray, frays, frayed, fraying
*Ending in single consonant (besides "y") preceded by single stressed vowel: zap, zaps, zapped, zapping
*Ending in consonant otherwise: trick, tricks, tricked, tricking

Other languages have different numbers of regular verbs; for instance, French divides regular verbs into just three categories ("er", "ir", and "re" endings). How many patterns of conjugation are considered standard in a given language is often up for debate. If a large enough group of irregular verbs in a language have parallel conjugations, it is almost arbitrary whether to count that as an additional "standard" conjugation or as a large collection of irregular verbs. (In Spanish, for example, there are nearly as many verbs that conjugate like "pensar" as those that do so like "vivir", and most of the latter type of verbs are very rarely used, yet "vivir" is always considered regular and "pensar" irregular.)

Differentiating between regular and irregular

What counts as an irregular verb is strongly dependent on the language itself. In English, the surviving strong verbs are considered irregular. In Old English, by contrast, the strong verbs are usually not considered irregular, at least not only by virtue of being strong verbs: there were several recognized classes of strong verbs, which were regular within themselves.

In Latin, similarly, most verbs outside the first or fourth conjugations have three principal parts, which form part of the lexicon and must be learned. The three principal parts are the present tense stem, the perfect tense stem, and the past participle; a variety of inflections, ablaut, and sometimes reduplication are used to form these parts. For example, the principal parts of "spondeō" ("I promise") include "spondēre" ("to promise"), "spopondī" ("I promised"), showing reduplication, and "sponsus" ("promised"); these forms cannot be predicted from the present stem, but when you know all four, the entire system can be constructed from these three parts by rule. This verb is not usually considered irregular in Latin. Latin also exhibits deponent verbs, inflected in the passive voice alone; and defective verbs, missing some principal parts. Truly irregular verbs in Latin are a rather small class; they include "esse" ("to be"); "dare" and its derivatives ("to give"); "edere" ("to eat"); "ferre" and its derivatives ("to carry"); "velle" and its derivatives ("to wish"); "ire" and its derivatives ("to go"); "fieri" ("to become")and "malle" ("to prefer"). Most irregular Latin verbs are themselves vestiges of the athematic conjugations of Indo-European, a surviving (and regular) group found in Greek.

Greek and Sanskrit show even greater complexities, with widely different thematic and athematic inflection sets; which set goes with which verb stem cannot be predicted by rule. In languages of this type, these variations are not usually enough to label a verb "irregular". They instead form a part of the lexicon; when a verb is learned, the various patterns used to conjugate it must also be learned.

By contrast, in modern English, the strong verbs are largely a closed and vestigial class. (Analogy has created a few new strong verbs, such as "dive".) All of the surviving strong verbs differ markedly from other verbs, and thus are classified as "irregular"; here, they are conspicuous exceptions in the midst of a much larger class of rule-bound regular verbs.

Prefixed verbs

In English, "to withhold" conjugates exactly like "to hold", and in Spanish, "detener" ("to detain") conjugates exactly like "tener" ("to have"). In each case, it is questionable if the compound verb and the main verb are both irregular verbs, or as a single irregular verb, with an optional prefix. The question is compounded by the fact that it is not always predictable if the compound conjugates the same as the base. In Spanish, "bendecir" ("to bless") conjugates almost exactly like "decir" ("to say"), but there are significant differences in a few tenses that are impossible to foresee.

Irregular in spelling only

In some languages, the count of irregular verbs could be greatly expanded if one were to count verbs that are irregular only in their spelling, but not in their pronunciation. For example, in Spanish, the verb "rezar" ("to pray") is conjugated in the present subjunctive as "rece", "reces", "rece", etc. The substitution of "c" for "z" does not affect the pronunciation. It is strictly a matter of orthography and can be perfectly predicted (if one knew the rules of Spanish pronunciation and orthography but had never seen the verb "rezar" before, one would still know that the verb would have to be spelled with a "c" in the present subjunctive). Therefore, this verb is not always considered irregular.

English has similar cases; the verb "pay" "sounds" regular: "I pay", "I paid", and "I have paid" are all pronounced as expected. But the spelling is irregular and that cannot be perfectly predicted—for example, "pay" and "lay" turn into "paid" and "laid", but "sway" and "stay" turn into "swayed" and "stayed". For this reason "pay" and verbs like it are almost always considered irregular.

ee also

*English irregular verbs
*List of English irregular verbs
*Spanish irregular verbs

External links

* Germanic languages
**
** [http://www.iee.et.tu-dresden.de/~wernerr/grammar/verben_dt.html A list of irregular German verbs; notes are in German]
** [http://www.verbbusters.com/vsearch.php English Irregular Verb Search] English Irregular Verb Search
** [http://www.englisch-hilfen.de/en/grammar/unreg_verben2.htm Learn English verbs effectively]
** [http://www.ego4u.com/en/cram-up/grammar/irregular-verbs List of irregular English verbs and exercises]
** [http://www.theirregularverbs.com/ TheIrregularVerbs] All the irregular verbs of the English language. Conjugation, pronunciation, translation and examples
** [http://www.irregularenglish.com/ Irregular English Verbs online exercises] Practice online exercises with the irregular verbs ans examples
** [http://www.irregular-verbs.info/ Free irregular verbs test] Online English irregular verb tests.

* Romance languages
** [http://web.archive.org/web/20050403154950/http://forumromanum.org/latin/irregularv.html ForumRomanum.org (very partial) list of Latin irregular verbs]
** The Catalan-language Wikipedia article on irregular verbs includes a list of irregular Catalan verbs.
** [http://www.orbilat.com/Languages/Asturian/Grammar/Asturian-Verb-Irregular_Verbs.html Orbis Latinus notes on irregular Asturian verbs]
** [http://www.orbilat.com/Languages/French/Grammar/Verbs/index.html Orbis Latinus list of irregular French verbs]
** [http://www.orbilat.com/Languages/Italian/Grammar/Verbs/index.html Orbis Latinus list of irregular Italian verbs]
** [http://www.orbilat.com/Languages/Occitan/Grammar/Verbs/index.html Orbis Latinus list of irregular Occitan / Provençal verbs ]
** [http://www.orbilat.com/Languages/Portuguese/Grammar/Verbs/index.html Orbis Latinus list of irregular Portuguese verbs]
** [http://www.orbilat.com/Languages/Spanish/Grammar/Verbs/index.html Orbis Latinus list of irregular Spanish verbs]
** [http://www.orbilat.com/Languages/Venetan/Grammar/Verbs/index.htm Orbis Latinus list of irregular Venetan verbs]
** [http://italian.about.com/library/weekly/aa080200a.htm Italian: list of principal irregular second and third conjugation verbs]

* Other Indo-European languages
** [http://ioa.com/~cwconrad/Docs/IrregularVerbsGNT.pdf PDF on irregular verbs in the Greek New Testament]