Demostrar means ‘to demonstrate’. It is a stem-changing -ar verb (o → ue): demuestro (present), demostré (preterite), demostrado (past participle), demostrando (gerund).
Demostrar in use
Demuestra mucho talentoShe shows a lot of talent
Demostró su inocenciaHe proved his innocence
Demostrar interésTo show interest
On this pageIndicative
Indicative
Statements of fact, certainty and objective reality
ending the ending you addstem letters that changehaber auxiliary
The other perfect tenses (haber + past participle) and the past subjunctive
The imperfect subjunctive has two forms: -ra (more common in speech) and -se (more formal; still heard in speech in Spain, mainly written in Latin America). Both are equally correct and interchangeable.
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