Fundir Conjugation in Spanish
The Spanish verb fundir means to melt, to merge, and it is a verb you will use again and again once you know it. Fundir means to melt or to merge, and it covers melting metal, ice and cheese, and merging two companies: fundir el hierro, fundirse con otra empresa. It is a regular -ir verb. Like every Spanish verb, fundir changes its ending for each person and tense, and 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 fundo el hierro en el horno, and in the preterite you say fundí dos empresas en una. 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: fundir
- English: to melt, to merge
- Verb type: regular -ir verb
- Ending: -ir
- Gerund: fundiendo
- Past participle: fundido
- Auxiliary verb: haber (all perfect tenses are formed with haber + fundido)
Pronunciation is not listed on this page: the verified tables do not include IPA for fundir, so no pronunciation is given rather than an invented one. Fundir is regular: fundí, fundía, fundiré.
Full conjugation tables
Every form below comes from the verified conjugation tables for fundir. 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.
Present indicative
| Person | Form |
|---|---|
| yo | fundo |
| tú | fundes |
| él/ella/Ud. | funde |
| nosotros/as | fundimos |
| vosotros/as | fundís |
| ellos/ellas/Uds. | funden |
Preterite
| Person | Form |
|---|---|
| yo | fundí |
| tú | fundiste |
| él/ella/Ud. | fundió |
| nosotros/as | fundimos |
| vosotros/as | fundisteis |
| ellos/ellas/Uds. | fundieron |
Imperfect
| Person | Form |
|---|---|
| yo | fundía |
| tú | fundías |
| él/ella/Ud. | fundía |
| nosotros/as | fundíamos |
| vosotros/as | fundíais |
| ellos/ellas/Uds. | fundían |
Future
| Person | Form |
|---|---|
| yo | fundiré |
| tú | fundirás |
| él/ella/Ud. | fundirá |
| nosotros/as | fundiremos |
| vosotros/as | fundiréis |
| ellos/ellas/Uds. | fundirán |
Conditional
| Person | Form |
|---|---|
| yo | fundiría |
| tú | fundirías |
| él/ella/Ud. | fundiría |
| nosotros/as | fundiríamos |
| vosotros/as | fundiríais |
| ellos/ellas/Uds. | fundirían |
Present perfect
| Person | Form |
|---|---|
| yo | he fundido |
| tú | has fundido |
| él/ella/Ud. | ha fundido |
| nosotros/as | hemos fundido |
| vosotros/as | habéis fundido |
| ellos/ellas/Uds. | han fundido |
Pluperfect
| Person | Form |
|---|---|
| yo | había fundido |
| tú | habías fundido |
| él/ella/Ud. | había fundido |
| nosotros/as | habíamos fundido |
| vosotros/as | habíais fundido |
| ellos/ellas/Uds. | habían fundido |
Future perfect
| Person | Form |
|---|---|
| yo | habré fundido |
| tú | habrás fundido |
| él/ella/Ud. | habrá fundido |
| nosotros/as | habremos fundido |
| vosotros/as | habréis fundido |
| ellos/ellas/Uds. | habrán fundido |
Conditional perfect
| Person | Form |
|---|---|
| yo | habría fundido |
| tú | habrías fundido |
| él/ella/Ud. | habría fundido |
| nosotros/as | habríamos fundido |
| vosotros/as | habríais fundido |
| ellos/ellas/Uds. | habrían fundido |
Present subjunctive
| Person | Form |
|---|---|
| yo | funda |
| tú | fundas |
| él/ella/Ud. | funda |
| nosotros/as | fundamos |
| vosotros/as | fundáis |
| ellos/ellas/Uds. | fundan |
Imperfect subjunctive (-ra)
| Person | Form |
|---|---|
| yo | fundiera |
| tú | fundieras |
| él/ella/Ud. | fundiera |
| nosotros/as | fundiéramos |
| vosotros/as | fundierais |
| ellos/ellas/Uds. | fundieran |
Imperative (affirmative)
| Person | Form |
|---|---|
| tú | funde |
| él/ella/Ud. | funda |
| nosotros/as | fundamos |
| vosotros/as | fundid |
| ellos/ellas/Uds. | fundan |
Imperative (negative)
| Person | Form |
|---|---|
| tú | fundas |
| él/ella/Ud. | funda |
| nosotros/as | fundamos |
| vosotros/as | fundáis |
| ellos/ellas/Uds. | fundan |
Gerund and past participle
| Form | Spanish | Use |
|---|---|---|
| Gerund | fundiendo | with estar for the progressive: estoy fundiendo |
| Past participle | fundido | with haber for the perfect tenses: he fundido |
How to use each tense
Present indicative
Use the present for routines, general facts and what is happening right now. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the present looks like this in a real sentence: Fundo el hierro en el horno. Learn the present forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Preterite
Use the preterite for finished actions with a clear end, often with ayer, el año pasado or anoche. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the preterite looks like this in a real sentence: Ayer, fundí el hielo con el calor. Learn the preterite forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Imperfect
Use the imperfect for background, habits and actions in progress in the past, often with de niño, antes or mientras. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the imperfect looks like this in a real sentence: De niño, fundía dos empresas en una. Learn the imperfect forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Future
Use the future for plans, predictions and promises, often with mañana, el año que viene or pronto. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the future looks like this in a real sentence: Mañana, fundiré el queso en la pizza. Learn the future forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Conditional
Use the conditional for polite requests, hypotheticals and what would happen, often with si clauses. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the conditional looks like this in a real sentence: Fundiría el hierro en el horno si pudiera. Learn the conditional forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Present perfect
Use the present perfect for recent actions and experiences, often with hoy, esta semana or ya. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the present perfect looks like this in a real sentence: Hoy, he fundido el hielo con el calor. Learn the present perfect forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Pluperfect
Use the pluperfect when one past action happened before another past action. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the pluperfect looks like this in a real sentence: Había fundido dos empresas en una antes de salir. Learn the pluperfect forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Future perfect
Use the future perfect for something that will already be finished by a future time. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the future perfect looks like this in a real sentence: Para mañana, habré fundido el queso en la pizza. Learn the future perfect forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Conditional perfect
Use the conditional perfect for what would have happened under different conditions. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the conditional perfect looks like this in a real sentence: Habría fundido el hierro en el horno con más tiempo. Learn the conditional perfect forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Present subjunctive
Use the present subjunctive after expressions of wish, doubt, emotion and hope, such as espero que or quiero que. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the present subjunctive looks like this in a real sentence: Espero que él funda el hielo con el calor. Learn the present subjunctive forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Imperfect subjunctive (-ra)
Use the imperfect subjunctive after past wishes and in si clauses about the past, and note the -ra forms shown here; the -se forms use the same stem. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the imperfect subjunctive looks like this in a real sentence: Si él fundiera dos empresas en una, todo cambiaría. Learn the imperfect subjunctive forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Imperative (affirmative)
Use the affirmative imperative for direct commands, instructions and invitations. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the affirmative imperative looks like this in a real sentence: ¡Funde el queso en la pizza! Learn the affirmative imperative forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Imperative (negative)
Use the negative imperative, always with no, to tell someone not to do something. For this verb the tense is regular, so the forms follow the standard endings for its verb class. For fundir, the negative imperative looks like this in a real sentence: No fundas el hierro en el horno. Learn the negative imperative forms in the table above alongside this example, and notice how the ending, not the stem, usually carries the meaning of the tense.
Example sentences
Ten natural sentences with fundir, covering different tenses and persons. Each one uses a form from the tables above.
- Fundo el hierro en el horno. — I melt iron in the furnace.
- Funde el hielo con el calor. — He/she melts ice with the heat.
- Ayer, fundí dos empresas en una. — Yesterday, I melted two companies into one.
- Antes, nosotros fundíamos el queso en la pizza. — Before, we used to melt cheese on the pizza.
- Mañana, tú fundirás el hierro en el horno. — Tomorrow, you will melt iron in the furnace.
- Yo fundiría el hielo con el calor si tuviera más tiempo. — I would melt ice with the heat if I had more time.
- Él ha fundido dos empresas en una. — He has melted two companies into one.
- Espero que él funda el queso en la pizza. — I hope he melts cheese on the pizza.
- Yo ya había fundido el hierro en el horno antes de salir. — I had already melted iron in the furnace before leaving.
- Ellos fundían el hielo con el calor cuando eran jóvenes. — They used to melt ice with the heat when they were young.
Common mistakes
- Wrong: Yo funde el hierro en el horno. — Right: Yo fundo el hierro en el horno. — The person matters: funde is the él/ella/Ud. form, while the yo form is fundo. Using the third-person form with yo is one of the most common beginner errors.
- Wrong: Ayer yo fundo el hielo con el calor. — Right: Ayer yo fundí el hielo con el calor. — The present and the preterite are different tenses: fundo is happening now, while fundí is a finished action in the past. Use the preterite with ayer.
- Wrong: Treating fundir and derretir as identical in every context. — Right: Fundir means to melt, to merge, while derretir means to melt. — They overlap, but each has uses the other does not: fundir fits sentences such as Fundo el hierro en el horno, while derretir belongs in a different sentence. Check the meaning you want before choosing.
- Wrong: Yo soy fundido el hielo con el calor. — Right: Yo he fundido el hielo con el calor. — Spanish perfect tenses use haber, not ser: he fundido, has fundido, ha fundido. Ser plus the participle makes a passive, not a perfect tense.
- Wrong: De niño, yo fundí dos empresas en una todos los días. — Right: De niño, yo fundía dos empresas en una todos los días. — For a repeated habit in the past, use the imperfect (fundía), not the preterite. The preterite (fundí) is for one finished action.
Quiz: test yourself
Ten questions on fundir. Choose the right form, then check the answer key below.
Complete the sentence: Yo ___ el hierro en el horno. (present tense) A. fundo B. fundes C. funde D. fundimos
Complete the sentence: Ayer, él ___ el hielo con el calor. (preterite) A. fundí B. fundiste C. fundimos D. fundió
Complete the sentence: Antes, nosotros ___ dos empresas en una. (imperfect) A. fundías B. fundo C. fundíamos D. fundía
Complete the sentence: Mañana, tú ___ el queso en la pizza. (future) A. fundiremos B. fundirás C. fundiré D. fundirá
Complete the sentence: Yo ___ el hierro en el horno si pudiera. (conditional) A. fundiría B. fundirías C. fundiríamos D. fundo
Complete the sentence: Espero que él ___ el hielo con el calor. (present subjunctive) A. fundas B. fundamos C. fundo D. funda
Complete the sentence: Si yo ___ dos empresas en una, todo cambiaría. (imperfect subjunctive, -ra form) A. fundiéramos B. fundo C. fundiera D. fundieras
Complete the sentence: Nosotros ___ el queso en la pizza. (present perfect) A. ha fundido B. hemos fundido C. he fundido D. has fundido
Complete the command: ¡___ el hierro en el horno! (affirmative imperative, tú) A. funde B. funda C. fundamos D. fundid
Which is the gerund of fundir, used with estar for the progressive? A. fundido B. fundo C. fundí D. fundiendo
Answer key
- fundo — The yo present tense of fundir is fundo.
- fundió — The él/ella/Ud. preterite of fundir is fundió.
- fundíamos — The nosotros/as imperfect of fundir is fundíamos.
- fundirás — The tú future of fundir is fundirás.
- fundiría — The yo conditional of fundir is fundiría.
- funda — The él/ella/Ud. present subjunctive of fundir is funda.
- fundiera — The yo imperfect subjunctive, -ra form of fundir is fundiera.
- hemos fundido — The nosotros/as present perfect of fundir is hemos fundido.
- funde — The affirmative tú imperative of fundir is funde.
- fundiendo — The gerund of fundir is fundiendo: estoy fundiendo. The participle fundido is used with haber instead.
Frequently asked questions
What does fundir mean in English?
Fundir means to melt, to merge. It is used in everyday situations such as Fundo el hierro en el horno. The exact English wording depends on the context, but the core meaning stays the same across the tenses.
Is fundir regular or irregular?
Fundir is a fully regular -ir verb, so every tense follows the standard endings for its class. Once you know the regular pattern, you can produce every form on this page, including fundo in the present and fundí in the preterite.
What is the difference between fundir and derretir?
Fundir means to melt, to merge, while derretir means to melt. They are easy to confuse because they appear in similar situations, but they are not interchangeable: use fundir when you mean to melt, to merge, as in Fundo el hierro en el horno, and use derretir for to melt. When in doubt, check the object of the sentence — it usually shows which verb fits.
How do I say “I melt” in the past?
It depends on the kind of past. For one finished action, use the preterite: yo fundí el hielo con el calor. For a repeated habit or background in the past, use the imperfect: yo fundía dos empresas en una. For something that has just happened, use the present perfect: yo he fundido el hielo con el calor.
How do I practise fundir?
Start with the present tense table, then drill the preterite and the imperfect, since those two past tenses cause the most mistakes. Try the fundir examples and quiz page for more sentences, and use the Spanish Verb Quiz to test the forms under pressure.
Related links
- Fundir in the present tense — the full present-tense table for fundir.
- Fundir examples and quiz — more example sentences and practice for fundir.
- Spanish verbs — the Spanish hub, with every verb and tense guide.
- Fluir conjugation — another -ir verb to compare with fundir.
- Huir conjugation — another -ir verb to compare with fundir.
- Fingir conjugation — another -ir verb to compare with fundir.
- Spanish Verb Conjugator — conjugate any Spanish verb in every tense.
- Spanish Verb Quiz — test yourself on real conjugated forms.