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CAT Preparation: Irregular Verbs

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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.

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).


The English language has a large number of irregular verbs. In the great majority of these, the past participle and/or past tense is not formed according to the usual patterns of English regular verbs. Other parts of the verb - such as the present 3rd person singular -s or -es, and present participle -ing - may still be formed regularly.

Among the exceptions are the verb to be and certain defective verbs which cannot be conjugated into certain tenses.

Most English irregular verbs are native, originating in Old English. They also tend to be the most commonly used verbs. The ten most commonly used verbs in English are all irregular.


What Counts As "Regular"?

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 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 to be 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.



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 to be irregular. In Old English, by contrast, the strong verbs are usually not considered to be 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 modern English, the strong verbs are largely a closed and vestigial class. 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.

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.

The substitution of "c" for "z" does not affect the pronunciation. It is strictly a matter of orthography and can be perfectly predicted. Therefore, this verb is not always considered to be 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 to be irregular.

Common Irregularities

common with most Indo-European languages, in English, such common verbs as to be, to be able, to do, and to have are extremely irregular.

This is a list of some irregular verbs in English. Of course, there are many others, but these are the more common irregular verbs.

Base Form Past Simple Past Participle
awake awoke awoken
be was, were been
become became become
cost cost cost
draw drew drawn
eat ate eaten
fall fell fallen
grow grew grown
hide hid hidden
keep kept kept
lend lent lent
make made made
pay paid paid
ring rang rung
sell sold sold
teach taught taught
understand understood understood
write wrote written


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References: English Club, Wikipedia

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