Deteriorar means ‘to damage/deteriorate’. It is a regular -ar verb: deterioro (present), deterioré (preterite), deteriorado (past participle), deteriorando (gerund).
Deteriorar in use
La humedad ha deteriorado los cuadrosThe damp has damaged the paintings
Su salud se deterioró rápidamenteHer health deteriorated rapidly
El tabaco deteriora los pulmonesSmoking damages the lungs
On this pageIndicative
Indicative
Statements of fact, certainty and objective reality
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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