Quick answer
"Demostró" is a form of "demostrar", a transitive verb which is often translated as "to demonstrate". "Probó" is a form of "probar", a transitive verb which is often translated as "to test". Learn more about the difference between "demostró" and "probó" below.
demostrar(
deh
-
mohs
-
trahr
)
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
1. (to explain)
a. to demonstrate
El Sr. Bloom ahora demostrará cómo se usa el carro eléctrico.Mr. Bloom will now demonstrate how to use the electric car.
b. to show
El aeromozo demostró la manera indicada de abrocharse el cinturón.The flight attendant showed the correct way to fasten your seatbelt.
2. (to give evidence of)
a. to prove
Stephen demostró su lealtad al rey.Stephen proved his loyalty to the king.
b. to demonstrate
Los resultados del experimento demuestran que la hipótesis es correcta.The results of the experiment demonstrate that the hypothesis is correct.
3. (to present)
a. to display
Chrissy demostró sus destrezas de baile.Chrissy displayed her dancing skills.
b. to show
Por el tono del discurso que dio en la cumbre, el presidente demostró que no tiene ningún sentido común.With the speech that he gave at the summit, the president showed that he has no common sense.
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probar(
proh
-
bahr
)
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
1. (to trial)
a. to test
Se tiene que probar este producto antes de venderlo.This product needs to be tested before selling it.
b. to try
¿Ya probaste la tarjeta a ver si funciona?Did you try the card to see if it works?
2. (culinary)
a. to taste
Déjame probar la sopa.Let me taste the soup.
b. to try
Nunca había probado cuy hasta ahora.I had never tried guinea pig until now.
3. (to demonstrate)
a. to prove
Solo el tiempo probará que estás equivocado.Only time can prove you that you're wrong.
probarse
A reflexive verb is a verb that indicates that the subject performs an action on itself (e.g. Miguel se lava.).
4. (clothing)
a. to try on
¿Por qué no te pruebas el vestido antes de comprarlo?Why don't you try the dress on before buying it?
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