Mostrar: Full Conjugation

Mostrar means "to show" and is an o → ue stem-changing -ar verb. Like recordar, contar, and encontrar, its o becomes ue in the four "boot" forms of the present indicative (yo, , él, ellos) and in the corresponding forms of the present subjunctive. The nosotros form keeps the plain o.

In Latin America, mostrar is the everyday verb for showing or displaying something — a photo, a document, a gesture, a feeling. It's also common in the reflexive form mostrarse, meaning "to appear" or "to come across as": se mostró muy amable.

Present Indicative

SubjectForm
yomuestro
muestras
él / ella / ustedmuestra
nosotros / nosotrasmostramos
ellos / ellas / ustedesmuestran

Te muestro las fotos del viaje.

I'll show you the photos from the trip.

La gráfica muestra un aumento claro.

The chart shows a clear increase.

Preterite

SubjectForm
yomostré
mostraste
él / ella / ustedmostró
nosotros / nosotrasmostramos
ellos / ellas / ustedesmostraron

The preterite is fully regular — no stem change. This is true of all -ar and -er stem-changing verbs.

Nos mostró su colección de monedas antiguas.

He showed us his collection of old coins.

Imperfect

SubjectForm
yomostraba
mostrabas
él / ella / ustedmostraba
nosotros / nosotrasmostrábamos
ellos / ellas / ustedesmostraban

Siempre me mostraba su jardín cuando la visitaba.

She always used to show me her garden when I visited.

Future

SubjectForm
yomostraré
mostrarás
él / ella / ustedmostrará
nosotros / nosotrasmostraremos
ellos / ellas / ustedesmostrarán

Mañana te mostraré la casa nueva.

Tomorrow I'll show you the new house.

Conditional

SubjectForm
yomostraría
mostrarías
él / ella / ustedmostraría
nosotros / nosotrasmostraríamos
ellos / ellas / ustedesmostrarían

Yo te mostraría el camino si pudiera.

I would show you the way if I could.

Present Subjunctive

SubjectForm
yomuestre
muestres
él / ella / ustedmuestre
nosotros / nosotrasmostremos
ellos / ellas / ustedesmuestren

Same pattern as the present indicative: ue everywhere except nosotros.

Quiero que me muestres tu trabajo.

I want you to show me your work.

Imperfect Subjunctive (-ra forms)

SubjectForm
yomostrara
mostraras
él / ella / ustedmostrara
nosotros / nosotrasmostráramos
ellos / ellas / ustedesmostraran

Imperative

PersonForm
tú (affirmative)muestra
tú (negative)no muestres
ustedmuestre
nosotrosmostremos
ustedesmuestren

Muéstrame lo que dibujaste.

Show me what you drew.

Notice the written accent on muéstrame: attaching a pronoun to the affirmative command pulls the stress backward, so an accent is needed to preserve the original pronunciation.

Non-Finite Forms

Common Uses

Mostrar is typically followed by a direct object (the thing shown) and an indirect object (the person shown to): le mostré la carta a Juan. The reflexive mostrarse is used to describe how someone appears or acts: se mostró preocupado ("he seemed worried").

Se mostró muy amable con los invitados.

He was very friendly with the guests.

El termómetro muestra 38 grados.

The thermometer shows 38 degrees.

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In many everyday situations, Latin American speakers use enseñar instead of mostrar to mean "to show": enséñame tu casa and muéstrame tu casa both mean "show me your house." Enseñar can feel slightly more colloquial, but the two verbs are interchangeable in this sense. Enseñar also means "to teach."
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Like all -ar stem-changing verbs, mostrar only changes in the stressed forms. A quick test: if the stress falls on the stem (MUES-tro), the vowel diphthongizes; if it falls on the ending (mos-TRA-mos), the stem stays plain.

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