interveneraron

Interveneraron is a Spanish verb form that is not recognized as correct in standard grammar. It is sometimes encountered as a reported or mistaken past tense form of intervenir, the verb meaning “to intervene.” The standard preterite for ellos is intervinieron, so the canonical form is ellos intervinieron.

Because intervenir is irregular in the preterite, its stem changes to intervín- and combines with the appropriate endings to yield intervinieron in the third person plural. The form interveneraron would represent a misapplication of regular -er/-ir verb endings to a stem that does not follow that regular pattern, and as such it is regarded as erroneous in normative usage.

In dictionaries and grammars of standard Spanish, interveneraron is not listed as a correct form. It may appear in informal writing, learner texts, or as a hypercorrection or typographical error. When documenting or quoting historical or regional texts, authors may encounter nonstandard spellings, but they are typically noted as nonstandard or incorrect rather than accepted forms.

Correct usage is to use intervinieron when referring to “they intervened.” Speakers and writers who encounter interveneraron should revise to the standard form to ensure grammatical accuracy. Understanding intervenirse as irregular in the preterite helps explain why interveneraron does not align with the expected conjugation pattern.

See also: intervenir, preterite in Spanish, Spanish verb conjugation, common verb irregularities.