Fiarse Conjugation in Spanish

The Spanish verb fiarse means to trust, and it is a verb you will use again and again once you know it. It is a regular -ar verb, reflexive verb: the stem is fi and the endings follow the -ar pattern, with the exceptions noted in the tables below. This page gives you the complete picture — every tense, every person, the gerund and the past participle, all from the verified conjugation tables. For example, in the present tense you say «Me fío todos los días», which means «I trust every day». Work through the tables below, read the notes for each tense, and then test yourself with the examples, the common mistakes and the quiz at the end of the page.

Quick facts

  • Infinitive: fiarse
  • English: to trust
  • Verb type: regular -ar verb, reflexive
  • Ending: -ar
  • Gerund: fiando
  • Past participle: fiado
  • Auxiliary verb: haber (all perfect tenses are formed with haber + fiado)
  • Reflexive pronouns: me, te, se, nos, os, se — one before every conjugated form, matching the person.

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

fiarse is reflexive: Me fío todos los días; te fías todos los días. Without the pronoun, the verb means doing the action to someone else rather than to yourself, so keep the pronoun with the form.

Full conjugation tables

Every form below comes from the verified conjugation tables for fiarse. The imperfect subjunctive is shown in its -ra forms; the -se forms use the same stem. For reflexive verbs, the pronoun column shows the reflexive pronoun that goes before each form.

Gerund: fiando · Past participle: fiado

Present Indicative

Person Pronoun Form
yo me fío
tú te fías
él/ella/Ud. se fía
nosotros/as nos fiamos
vosotros/as os fiáis
ellos/ellas/Uds. se fían

The present is the tense you will use most with fiarse. It covers daily routines, permanent facts and actions in progress. Learn the yo form fío first, then the tú and él forms, which are the ones that change the stem in stem-changing verbs.

Preterite

Person Pronoun Form
yo me fie
tú te fiaste
él/ella/Ud. se fio
nosotros/as nos fiamos
vosotros/as os fiasteis
ellos/ellas/Uds. se fiaron

The preterite of fiarse reports what happened. «Ayer yo fie por la tarde» places the action firmly in finished time. It is the tense of stories and reports, not of background description.

Imperfect

Person Pronoun Form
yo me fiaba
tú te fiabas
él/ella/Ud. se fiaba
nosotros/as nos fiábamos
vosotros/as os fiabais
ellos/ellas/Uds. se fiaban

The imperfect of fiarse paints the background of a past scene: repeated actions, states and descriptions. «Antes, yo fiaba todos los días» is the pattern. Pair it with the preterite when one event interrupts another.

Future

Person Pronoun Form
yo me fiaré
tú te fiarás
él/ella/Ud. se fiará
nosotros/as nos fiaremos
vosotros/as os fiaréis
ellos/ellas/Uds. se fiarán

The future of fiarse looks forward: what will happen tomorrow, next week or next year. «Mañana yo fiaré sin falta» is the pattern. Remember that the future can also express probability about the present in Spanish.

Conditional

Person Pronoun Form
yo me fiaría
tú te fiarías
él/ella/Ud. se fiaría
nosotros/as nos fiaríamos
vosotros/as os fiaríais
ellos/ellas/Uds. se fiarían

The conditional of fiarse is the tense of «would»: what you would do, what would happen, what you would like. «Si pudiera, yo fiaría sin dudarlo» shows the pattern. It is built on the infinitive, just like the future.

Present Perfect

Person Pronoun Form
yo me he fiado
tú te has fiado
él/ella/Ud. se ha fiado
nosotros/as nos hemos fiado
vosotros/as os habéis fiado
ellos/ellas/Uds. se han fiado

The present perfect of fiarse says «have done»: the action is finished but its result still matters now. «Hoy yo he fiado dos veces» is the pattern. Learn the participle fiado well — every perfect tense depends on it.

Pluperfect

Person Pronoun Form
yo me había fiado
tú te habías fiado
él/ella/Ud. se había fiado
nosotros/as nos habíamos fiado
vosotros/as os habíais fiado
ellos/ellas/Uds. se habían fiado

The pluperfect of fiarse steps one event further back than the preterite. «Antes de salir, yo había fiado» is the pattern: first this happened, then the story moved on. It is haber in the imperfect plus fiado.

Future Perfect

Person Pronoun Form
yo me habré fiado
tú te habrás fiado
él/ella/Ud. se habrá fiado
nosotros/as nos habremos fiado
vosotros/as os habréis fiado
ellos/ellas/Uds. se habrán fiado

The future perfect of fiarse combines the future of haber with fiado. «Para el viernes, yo habré fiado ya» is the pattern. Use it when the completion matters more than the action itself.

Conditional Perfect

Person Pronoun Form
yo me habría fiado
tú te habrías fiado
él/ella/Ud. se habría fiado
nosotros/as nos habríamos fiado
vosotros/as os habríais fiado
ellos/ellas/Uds. se habrían fiado

The conditional perfect of fiarse is the tense of «would have done». «Yo habría fiado si hubiera podido» is the pattern. It is built from haber in the conditional plus fiado.

Present Subjunctive

Person Pronoun Form
yo me fíe
tú te fíes
él/ella/Ud. se fíe
nosotros/as nos fiemos
vosotros/as os fiéis
ellos/ellas/Uds. se fíen

The present subjunctive of fiarse is the mood of what is wished, doubted or demanded rather than stated as fact. «Espero que tú fíes» is the pattern. If the trigger is in the past, switch to the imperfect subjunctive instead.

Imperfect Subjunctive (-ra forms)

Person Pronoun Form
yo me fiara
tú te fiaras
él/ella/Ud. se fiara
nosotros/as nos fiáramos
vosotros/as os fiarais
ellos/ellas/Uds. se fiaran

The imperfect subjunctive of fiarse handles the hypothetical past and the polite conditional. «Ojalá yo fiara más a menudo» is the pattern. The -ra forms in the table are the standard ones; the -se forms use the same stem with -se endings.

Imperative — Affirmative

Person Pronoun Form
tú te fía
él/ella/Ud. se fíe
nosotros/as nos fiemos
vosotros/as os fiad
ellos/ellas/Uds. se fíen

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

In real speech the reflexive pronoun attaches to the end of an affirmative command; the table shows the pronoun and the form separately so you can see both parts.

The affirmative imperative of fiarse is for orders and instructions. «¡fía, por favor!» is the pattern. Remember there is no yo form in the imperative, and the nosotros form doubles as a suggestion: «¡fiemos!» means «let's do it».

Imperative — Negative

Person Pronoun Form
tú te fíes
él/ella/Ud. se fíe
nosotros/as nos fiemos
vosotros/as os fiéis
ellos/ellas/Uds. se fíen

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

In real speech the reflexive pronoun attaches to the end of an affirmative command; the table shows the pronoun and the form separately so you can see both parts.

The negative imperative of fiarse is built on the present subjunctive: «¡No fíes!». Learn it as a set with the subjunctive table above, and never follow no with the affirmative command form.

Example sentences

  1. Me fío todos los días. — I trust every day.
  2. Ayer me fie por la tarde. — Yesterday I trusted in the afternoon.
  3. Antes, me fiaba todos los días. — In the past, I used to trust every day.
  4. Mañana me fiaré sin falta. — Tomorrow I will trust without fail.
  5. Si tuviera más tiempo, me fiaría ahora mismo. — If I had more time, I would trust right now.
  6. Hoy me he fiado dos veces. — Today I have trusted twice.
  7. Espero que te fíes pronto. — I hope You trust soon.
  8. Si me fiara, todo sería distinto. — If I trusted, everything would be different.
  9. Ahora mismo me estoy fiando. — Right now I am trusting.
  10. ¡No te fíes! — Don't trust!

Common mistakes

1. Forgetting the reflexive pronoun

Wrong: yo fío todos los días.

Right: me fío todos los días.

fiarse is reflexive: the pronoun me belongs before every conjugated form. Without it, you are using the non-reflexive verb, which means something different — doing the action to someone else instead of to yourself.

2. Using the imperfect for a finished event

Wrong: Ayer me fiaba.

Right: Ayer me fie.

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

3. Using the indicative after a subjunctive trigger

Wrong: Espero que te fías.

Right: Espero que te fíes.

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

4. Using the affirmative imperative after no

Wrong: No te fía.

Right: No te fíes.

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

5. Confusing the gerund with the past participle

Wrong: He fiando.

Right: He fiado.

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

Quiz

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

1. What is the ellos/ellas/Uds. form of fiarse in the present indicative?

- (a) fía
- (b) fían
- (c) fío
- (d) fías

2. What is the yo form of fiarse in the preterite?

- (a) fio
- (b) fiaste
- (c) fie
- (d) fiamos

3. What is the tú form of fiarse in the imperfect?

- (a) fiábamos
- (b) fiaba
- (c) fiaba
- (d) fiabas

4. What is the él/ella/Ud. form of fiarse in the future?

- (a) fiará
- (b) fiaré
- (c) fiaremos
- (d) fiarás

5. What is the nosotros/as form of fiarse in the conditional?

- (a) fiaría
- (b) fiarías
- (c) fiaríamos
- (d) fiaría

6. What is the vosotros/as form of fiarse in the present perfect?

- (a) he fiado
- (b) ha fiado
- (c) habéis fiado
- (d) has fiado

7. What is the ellos/ellas/Uds. form of fiarse in the present subjunctive?

- (a) fíe
- (b) fíen
- (c) fíes
- (d) fíe

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

- (a) fiaras
- (b) fiáramos
- (c) fiara
- (d) fiara

9. What is the gerund of fiarse?

- (a) fío
- (b) fiarse
- (c) fiado
- (d) fiando

10. What is the past participle of fiarse?

- (a) fiarse
- (b) fiando
- (c) fiado
- (d) fie

Answer key

1. (b) — In the present indicative, the ellos/ellas/Uds. form of fiarse is fían. The other options are the same tense but different persons. 2. (c) — In the preterite, the yo form of fiarse is fie. The other options are the same tense but different persons. 3. (d) — In the imperfect, the tú form of fiarse is fiabas. The other options are the same tense but different persons. 4. (a) — In the future, the él/ella/Ud. form of fiarse is fiará. The other options are the same tense but different persons. 5. (c) — In the conditional, the nosotros/as form of fiarse is fiaríamos. The other options are the same tense but different persons. 6. (c) — In the present perfect, the vosotros/as form of fiarse is habéis fiado. The other options are the same tense but different persons. 7. (b) — In the present subjunctive, the ellos/ellas/Uds. form of fiarse is fíen. The other options are the same tense but different persons. 8. (c) — In the imperfect subjunctive (-ra forms), the yo form of fiarse is fiara. The other options are the same tense but different persons. 9. (d) — The gerund of fiarse is fiando. It is used with estar for the progressive: «Estoy fiando». 10. (c) — The past participle of fiarse is fiado. It follows haber in all the perfect tenses: «he fiado».

Frequently asked questions

Is fiarse regular or irregular?

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

What are the gerund and past participle of fiarse?

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

How do I say «I trust» in Spanish?

Say «Me fío 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 fiarse?

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

When do I use the subjunctive with fiarse?

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

What does the -se in fiarse mean?

The -se marks fiarse as reflexive: the action comes back to the subject. You always pair the form with its pronoun — me, te, se, nos, os, se — placed before the conjugated verb. Dropping the pronoun changes the meaning, so treat the pronoun as part of the verb.

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