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I'd like to confirm something that I read long ago in a since-forgotten source. I'm not sure if it was an accepted theory, fact or just a marginalized idea. But, essentially, the story goes:

  1. There was a single European language.
  2. The language divided into two groups: one that spoke in regular verbs, another in irregular.
  3. The groups eventually re-joined and blended the two types of verbs into a new language.
  4. From there, all European languages evolved with a combination of regular and irregular verbs.
  5. That is why the same verbs tend to be irregular in various European languages, although they've taken on completely different forms.

Is there any truth to that idea? If so, would those original languages have been Proto-Indo-European or something else? Geographical location? Causes of the division and reunion?

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That's not a generally accepted idea. Either you've misremembered, or the source you were reading was indeed marginal (the field of etymology, sad to say, sees a lot of cranks.)

The definition of a "regular" verb is not very exact. As time changes, some verbs that were once regular become irregular due to sound changes, and some verbs that were once irregular become regular due to analogy. The ancestor of the verb "hide" in Old English was regular, but it is irregular in modern English due to a process of vowel shortening. The ancestor of the verb "seethe" had a relatively "irregular" consonant alternation ("sodden" comes from the old past participle) but it is regular in modern English because new past forms were made using the present form as the basis. Occasionally, we even see regular verbs become "irregular" due to analogy, as with dive developing the past form dove based on drive and the like, or sneak developing the past tense snuck. Generally, irregular verbs are disproportionately common in a language, because the uncommon verbs become regularized more quickly.

So, which verbs are regular and which are irregular is not actually consistent even across related languages, although there are some shared irregular words that are extremely common, and shared regular words that are less common (which might give this impression at first glance).

Also, it's unclear what you mean by "the same words" in different languages. Due to changes in meaning, semantically equivalent verbs in different Indo-European languages are often not etymologically related to each other.

Examples comparing English to French (since that's the language I know best after English):

Irregular in both languages:

  • "be" = French être. In both languages, this verb is "suppletive," which means not all of its forms come from the same source. Half of the irregularity is due to this, and actually, the pattern of suppletion is different in each language. Some parts of them are historically related, though (like English is and French est for the third person present singular form).
  • "have" = French avoir. BUT note that these words are not descended from the same source.
  • "go" = French aller. BUT note that these words are not descended from the same source.
  • "know" = French savoir and connaître. English know is related to the middle part of connaître. The "irregularities" are mainly of unrelated origin.

Irregular in English, regular in French:

  • "speak" = French parler
  • "fall" = French tomber
  • "leave (let alone)" = French laisser
  • "sing" = French chanter
  • "give" = French donner
  • "find" = French trouver

Regular in English, irregular in French:

  • "live" = vivre
  • "die" = mourir
  • "want" = vouloir
  • "please" = plaire
  • "follow" = suivre

To put the claims you mention in perspective, it might also help to compare irregular verbs in English and other Indo-European languages to those in Basque and Hungarian (which are not related to Indo-European languages (or to each other) within a timeframe that we know of). Wikipedia says that Basque has irregular verbs meaning things like "be," "have," and "say," and Hungarian has irregular verbs meaning "to be", "to come" and "to go." Even though they're not related, it shouldn't be surprising that the irregular verbs have similar meanings in Indo-European languages, Basque, and Hungarian, for two reasons:

  1. verbs meaning things like "be" or "have" are usually among the most commonly used verbs in a language, and therefore more likely to be irregular for the reason I mentioned earlier
  2. languages near each other can influence each other, even if they don't share a common source. For example, even though the "have" verb in Germanic languages and the "avoir" verb in Romance languages are not originally related, they are thought to have influenced each other in usage.

The closest thing I can think of: In English, many "irregular" verbs are the remnant of Germanic "strong verbs," (which generally descend from Proto-Indo-European verbal roots) while English regular verb morphology is based on Germanic "weak verbs," which was the class for verbs derived from non-verbal Proto-Indo-European roots.

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  • It is noteworthy, however, that the highest concentration of irregular verbs are among a language's most commonly used verbs. For example, the verb "to be" is irregular in every European language. Also, the coincidence of counterpart verbs being irregular, such as "to read," "to know," "to go," to have," "to leave," all being irregular across Europe's languages is uncanny. That is it seems highly unlikely that these verbs that are irregular in English are also the exact same verbs that are irregular in so many other European languages, like Portuguese. – Benjamin Harman Jan 11 '16 at 11:37
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    I thought I mentioned that irregular verbs tend to be common verbs, and vice versa. "To read," "to know," "to go," "to have," and "to leave" are all common verbs. It's not surprising that they're irregular. – brass tacks Jan 11 '16 at 11:45
  • @BenjaminHarman: edited to add examples of common irregular verbs that are not the exact same in English and French, two European languages – brass tacks Jan 11 '16 at 12:06
  • Thanks for both the response and added information. I agree with you that the OP's assertion is not generally accepted. I'm not sure that the OP remembered incorrectly. While I have no direct evidence to the OP's assertion, it is possible that he is correctly remembering someone's hypothesis as to the formation and origins of European languages. Again, not saying that it's right, but one could draw a line from the commonality European languages all share for having roughly the same set of verbs being irregular to the possibility of a common origin. OP is asking about that theory. – Benjamin Harman Jan 12 '16 at 2:14
  • I just remembered the source, although only generally. Many years ago I used to listen to audios from The Teaching Company, and it would have come from a course on "The History of Human Language" or something with a similar name. Their presenters are usually (or at least used to be) highly esteemed professors from prestigious universities. Not sure if he said it was just a hypothesis or a validated theory; but considering the source, I think it's an idea that was probably taken rather seriously among certain cognescenti. ... Sorry I can't be more specific. That's why I'm asking. – Matt Jan 12 '16 at 9:15

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