Entusiasmar Conjugation in Spanish

Learning to conjugate entusiasmar — «to excite» — opens up a whole set of sentences you will use every day. It is a regular -ar verb verb, and this page covers it completely: thirteen tenses, the gerund entusiasmando and the past participle entusiasmado, example sentences in every tense, the common mistakes and a quiz with an answer key. A good first sentence to learn is «Yo entusiasmo todos los días» — I excite every day. Once you can say that, the rest of the table falls into place person by person.

Quick facts

  • Infinitive: entusiasmar
  • English: to excite
  • Verb type: regular -ar verb
  • Ending: -ar
  • Gerund: entusiasmando
  • Past participle: entusiasmado
  • Auxiliary verb: haber (all perfect tenses are formed with haber + entusiasmado)

Pronunciation is not listed on this page: the verified tables do not include IPA for entusiasmar, so no pronunciation is given rather than an invented one.

Full conjugation tables

Every form below comes from the verified conjugation tables for entusiasmar. The imperfect subjunctive is shown in its -ra forms; the -se forms use the same stem.

Gerund: entusiasmando · Past participle: entusiasmado

Present Indicative

Person Form
yo entusiasmo
tú entusiasmas
él/ella/Ud. entusiasma
nosotros/as entusiasmamos
vosotros/as entusiasmáis
ellos/ellas/Uds. entusiasman

The present tense describes habits, facts and what is happening now. For entusiasmar, the yo form is entusiasmo, as in the examples below. Use the present for routines («todos los días») and for general truths, and remember that Spanish often uses the present where English would use a progressive or a near future.

Preterite

Person Form
yo entusiasmé
tú entusiasmaste
él/ella/Ud. entusiasmó
nosotros/as entusiasmamos
vosotros/as entusiasmasteis
ellos/ellas/Uds. entusiasmaron

The preterite describes completed actions in the past — things that started and finished. «Ayer yo entusiasmé» is the classic use. Do not confuse it with the imperfect: the preterite moves the story forward, one finished event at a time.

Imperfect

Person Form
yo entusiasmaba
tú entusiasmabas
él/ella/Ud. entusiasmaba
nosotros/as entusiasmábamos
vosotros/as entusiasmabais
ellos/ellas/Uds. entusiasmaban

The imperfect describes the past as background: habits, descriptions and actions in progress. «De pequeño, yo entusiasmaba» shows the habitual use. It sets the scene while the preterite reports what happened inside it.

Future

Person Form
yo entusiasmaré
tú entusiasmarás
él/ella/Ud. entusiasmará
nosotros/as entusiasmaremos
vosotros/as entusiasmaréis
ellos/ellas/Uds. entusiasmarán

The future tense states what will happen. For entusiasmar the future is built on the infinitive: «Mañana yo entusiasmaré». It is also used for predictions and promises, and in spoken Spanish it often alternates with ir a + infinitive.

Conditional

Person Form
yo entusiasmaría
tú entusiasmarías
él/ella/Ud. entusiasmaría
nosotros/as entusiasmaríamos
vosotros/as entusiasmaríais
ellos/ellas/Uds. entusiasmarían

The conditional expresses what would happen: wishes, polite requests and hypothetical results. «Si tuviera más tiempo, yo entusiasmaría» is the typical pattern. It shares its stem with the future and changes only the endings.

Present Perfect

Person Form
yo he entusiasmado
tú has entusiasmado
él/ella/Ud. ha entusiasmado
nosotros/as hemos entusiasmado
vosotros/as habéis entusiasmado
ellos/ellas/Uds. han entusiasmado

The present perfect connects the past with the present: something that has happened, often today or recently. It is haber in the present plus the past participle: «Hoy yo he entusiasmado». In Spain it is used for anything that happened today; in Latin America the preterite is often preferred.

Pluperfect

Person Form
yo había entusiasmado
tú habías entusiasmado
él/ella/Ud. había entusiasmado
nosotros/as habíamos entusiasmado
vosotros/as habíais entusiasmado
ellos/ellas/Uds. habían entusiasmado

The pluperfect describes an event that happened before another past event: «Cuando llegué, ya había entusiasmado». It is haber in the imperfect plus the past participle, and it is the tense for explaining what had already happened when something else took place.

Future Perfect

Person Form
yo habré entusiasmado
tú habrás entusiasmado
él/ella/Ud. habrá entusiasmado
nosotros/as habremos entusiasmado
vosotros/as habréis entusiasmado
ellos/ellas/Uds. habrán entusiasmado

The future perfect looks back from a future point: by then, something will already have happened. «Para mañana, yo habré entusiasmado» is the pattern — haber in the future plus the past participle. It is less common in speech but regular in formal writing.

Conditional Perfect

Person Form
yo habría entusiasmado
tú habrías entusiasmado
él/ella/Ud. habría entusiasmado
nosotros/as habríamos entusiasmado
vosotros/as habríais entusiasmado
ellos/ellas/Uds. habrían entusiasmado

The conditional perfect expresses what would have happened: «Yo habría entusiasmado si hubiera podido». It is haber in the conditional plus the past participle, and it is the tense for regrets and missed chances.

Present Subjunctive

Person Form
yo entusiasme
tú entusiasmes
él/ella/Ud. entusiasme
nosotros/as entusiasmemos
vosotros/as entusiasméis
ellos/ellas/Uds. entusiasmen

The present subjunctive appears after wishes, doubts, emotions and impersonal expressions: «Espero que él entusiasme». The trigger is in the main clause; the subjunctive is the mood of uncertainty, desire and influence. Learn the yo form first — most of the table follows from it.

Imperfect Subjunctive (-ra forms)

Person Form
yo entusiasmara
tú entusiasmaras
él/ella/Ud. entusiasmara
nosotros/as entusiasmáramos
vosotros/as entusiasmarais
ellos/ellas/Uds. entusiasmaran

The imperfect subjunctive is the past partner of the present subjunctive, used after past-tense triggers and in si-clauses: «Si él entusiasmara, todo sería distinto». The table above shows the -ra forms, the ones you will hear most often. There is also a less common -se set built on the same stem.

Imperative — Affirmative

Person Form
tú entusiasma
él/ella/Ud. entusiasme
nosotros/as entusiasmemos
vosotros/as entusiasmad
ellos/ellas/Uds. entusiasmen

There is no yo form in the imperative — you cannot command yourself.

The affirmative imperative gives direct commands and instructions: «¡entusiasma!». There is no yo form — you cannot command yourself. The tú form is the one you will use with friends and family, and the usted form with people you address formally.

Imperative — Negative

Person Form
tú entusiasmes
él/ella/Ud. entusiasme
nosotros/as entusiasmemos
vosotros/as entusiasméis
ellos/ellas/Uds. entusiasmen

There is no yo form in the imperative — you cannot command yourself.

The negative imperative tells someone not to do something: «¡No entusiasmes!». Unlike the affirmative imperative, the negative forms come from the present subjunctive, which is why they look different. Never use the affirmative form after no.

Example sentences

  1. Yo entusiasmo todos los días. — I excite every day.
  2. Ayer yo entusiasmé por la tarde. — Yesterday I excited in the afternoon.
  3. Antes, yo entusiasmaba todos los días. — In the past, I used to excite every day.
  4. Mañana yo entusiasmaré sin falta. — Tomorrow I will excite without fail.
  5. Si tuviera más tiempo, yo entusiasmaría ahora mismo. — If I had more time, I would excite right now.
  6. Hoy yo he entusiasmado dos veces. — Today I have excited twice.
  7. Espero que tú entusiasmes pronto. — I hope You excite soon.
  8. Si yo entusiasmara, todo sería distinto. — If I excited, everything would be different.
  9. Ahora mismo yo estoy entusiasmando. — Right now I am exciting.
  10. ¡entusiasma, por favor! — Excite, please!

Common mistakes

1. Using the imperfect for a finished event

Wrong: Ayer yo entusiasmaba.

Right: Ayer yo entusiasmé.

Yesterday's finished action needs the preterite, entusiasmé. The imperfect entusiasmaba describes what used to happen or what was going on, not a single completed event.

2. Using the indicative after a subjunctive trigger

Wrong: Espero que tú entusiasmas.

Right: Espero que tú entusiasmes.

After espero que, Spanish requires the subjunctive: entusiasmes, not the indicative entusiasmas. Wishes, hopes and doubts all trigger this change.

3. Using the affirmative imperative after no

Wrong: No entusiasma.

Right: No entusiasmes.

Negative commands use the subjunctive-based forms: no entusiasmes. The affirmative entusiasma can never follow no.

4. Using the infinitive instead of a conjugated form

Wrong: Yo entusiasmar todos los días.

Right: Yo entusiasmo todos los días.

The infinitive entusiasmar names the action; it never works as the main verb of a sentence. Conjugate it for the person: yo entusiasmo.

5. Confusing the gerund with the past participle

Wrong: He entusiasmando.

Right: He entusiasmado.

The perfect tenses use haber plus the past participle: he entusiasmado. The gerund entusiasmando goes with estar for actions in progress («Estoy entusiasmando»), never with haber.

Quiz

Test yourself on the forms above. Choose the correct answer, then check the key below.

1. What is the yo form of entusiasmar in the present indicative?

- (a) entusiasmamos
- (b) entusiasmas
- (c) entusiasmo
- (d) entusiasma

2. What is the tú form of entusiasmar in the preterite?

- (a) entusiasmé
- (b) entusiasmaste
- (c) entusiasmó
- (d) entusiasmamos

3. What is the él/ella/Ud. form of entusiasmar in the imperfect?

- (a) entusiasmabas
- (b) entusiasmábamos
- (c) entusiasmaba
- (d) entusiasmaba

4. What is the nosotros/as form of entusiasmar in the future?

- (a) entusiasmará
- (b) entusiasmarás
- (c) entusiasmaré
- (d) entusiasmaremos

5. What is the vosotros/as form of entusiasmar in the conditional?

- (a) entusiasmaría
- (b) entusiasmaría
- (c) entusiasmaríais
- (d) entusiasmarías

6. What is the ellos/ellas/Uds. form of entusiasmar in the present perfect?

- (a) ha entusiasmado
- (b) he entusiasmado
- (c) has entusiasmado
- (d) han entusiasmado

7. What is the yo form of entusiasmar in the present subjunctive?

- (a) entusiasmes
- (b) entusiasmemos
- (c) entusiasme
- (d) entusiasme

8. What is the tú form of entusiasmar in the imperfect subjunctive (-ra forms)?

- (a) entusiasmara
- (b) entusiasmaras
- (c) entusiasmáramos
- (d) entusiasmara

9. What is the gerund of entusiasmar?

- (a) entusiasmar
- (b) entusiasmando
- (c) entusiasmado
- (d) entusiasmo

10. What is the past participle of entusiasmar?

- (a) entusiasmar
- (b) entusiasmé
- (c) entusiasmando
- (d) entusiasmado

Answer key

1. (c) — In the present indicative, the yo form of entusiasmar is entusiasmo. The other options are the same tense but different persons. 2. (b) — In the preterite, the tú form of entusiasmar is entusiasmaste. The other options are the same tense but different persons. 3. (c) — In the imperfect, the él/ella/Ud. form of entusiasmar is entusiasmaba. The other options are the same tense but different persons. 4. (d) — In the future, the nosotros/as form of entusiasmar is entusiasmaremos. The other options are the same tense but different persons. 5. (c) — In the conditional, the vosotros/as form of entusiasmar is entusiasmaríais. The other options are the same tense but different persons. 6. (d) — In the present perfect, the ellos/ellas/Uds. form of entusiasmar is han entusiasmado. The other options are the same tense but different persons. 7. (c) — In the present subjunctive, the yo form of entusiasmar is entusiasme. The other options are the same tense but different persons. 8. (b) — In the imperfect subjunctive (-ra forms), the tú form of entusiasmar is entusiasmaras. The other options are the same tense but different persons. 9. (b) — The gerund of entusiasmar is entusiasmando. It is used with estar for the progressive: «Estoy entusiasmando». 10. (d) — The past participle of entusiasmar is entusiasmado. It follows haber in all the perfect tenses: «he entusiasmado».

Frequently asked questions

Is entusiasmar regular or irregular?

Yes — entusiasmar is a regular -ar verb. Learn the endings once and they work in every tense, with the stem entusiasm unchanged throughout.

What are the gerund and past participle of entusiasmar?

The gerund is entusiasmando and the past participle is entusiasmado. Use the gerund with estar for actions in progress («Estoy entusiasmando») and the participle with haber for the perfect tenses («he entusiasmado»).

How do I say «I excite» in Spanish?

Say «Yo entusiasmo todos los días». That is the yo form of the present tense, the form you need for talking about yourself right now.

What is the difference between the preterite and the imperfect of entusiasmar?

Use the preterite (entusiasmé) for a single finished event and the imperfect (entusiasmaba) for habits and background. «Ayer yo entusiasmé» reports something that happened and ended; «Antes, yo entusiasmaba» describes what used to happen.

When do I use the subjunctive with entusiasmar?

Use the subjunctive after wishes, doubts, emotions and impersonal expressions — for example «Espero que tú entusiasmes». The trigger sits in the main clause; once it is there, the subjunctive form is required, not a stylistic choice.

How do I use entusiasmar in the present perfect?

Put haber in the present before the past participle: «Hoy yo he entusiasmado». The participle entusiasmado never changes for person — only haber changes — so once you know the participle, the whole perfect tense follows.

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