demuestras

Demuestras is the second-person singular present indicative form of the Spanish verb demostrar, meaning you demonstrate or you prove. It is used when addressing someone directly with the subject tú and can refer to presenting evidence, showing that something is true, or making an argument.

Usage and nuance

Demostrar is used in diverse contexts, from everyday speech to mathematics and formal argumentation. With demuestras, you indicate that the person is currently providing proof, illustrating a point, or validating a claim. It commonly appears in sentences such as “Tú demuestras que la hipótesis es verdadera con esos cálculos” or “¿Qué demuestras con este experimento?” It is also found in phrases like “demuestras tu punto con hechos,” emphasizing evidence over opinion.

Grammar notes

Demostrar is a stem-changing -ar verb. In the present tense, the o changes to ue in all forms except the nosotros and vosotros forms: yo demuestro, tú demuestras, él demuestra, nosotros demostramos, vosotros demostráis, ellos demuestran. The vosotros form in Spain is demostráis, with an accent on the a. The negative form uses demuestes (tú no demuestres).

Noun versus verb usage

Demuestras is strictly a verb form, not a noun. The corresponding noun for a demonstration or proof is demostración. In most contexts, demuestras functions as part of a clause that asserts or asks for proof or demonstration.

Etymology

The verb derives from Latin demonstrare, meaning to point out or show. Over time it acquired senses related to proving, illustrating, and evidencing.