Fundir Present Tense Conjugation in Spanish
The present tense of fundir — “to melt, to merge” in English — is the form you need for what happens now, for habits and for general truths. This page gives you the full present conjugation table for fundir with all six persons, explains exactly how the tense is formed for this verb, shows when to use it with real examples, and finishes with a quiz so you can test yourself. 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. To see it in a real sentence: Fundo el hierro en el horno. — “I melt iron in the furnace.”
Present tense conjugation table: fundir
Every person of fundir in the present tense. The gerund is fundiendo and the past participle is fundido.
| Person | Form |
|---|---|
| yo | fundo |
| tú | fundes |
| él/ella/Ud. | funde |
| nosotros/as | fundimos |
| vosotros/as | fundís |
| ellos/ellas/Uds. | funden |
The gerund is fundiendo, which you use with estar to say what is happening right now: “Estoy fundiendo” means the action of fundir is in progress at this very moment. The past participle is fundido, which you use with haber in the perfect tenses: “he fundido” is the present perfect, used for a completed action. Keep both forms in mind as you read the examples below, because the present is only one part of how fundir is used.
How the present of fundir is formed
The present of fundir is built from the stem fund plus the present endings for -ir verbs. Take the infinitive, drop the -ir ending, and add the ending that matches the person. The table below shows the endings, and the full table above shows them attached to the stem.
| Person | Ending | Form |
|---|---|---|
| yo | -o | fundo |
| tú | -es | fundes |
| él/ella/Ud. | -e | funde |
| nosotros/as | -imos | fundimos |
| vosotros/as | -ís | fundís |
| ellos/ellas/Uds. | -en | funden |
fundir is a regular -ir verb in the present, so the table above is completely regular. The stem is fund and the endings are the normal -ir endings, so there are no surprises to memorise in this tense — the challenge is only using the forms naturally.
The gerund of fundir is fundiendo and the past participle is fundido. Both are the forms you need for the progressive and the perfect tenses with haber.
When to use the present of fundir
The present is not a single-purpose tense. Below are the five situations where you will use fundir in the present most often. Each one comes with a real example, so read the rule, then say the example out loud.
1. A routine or habit
The present tense of fundir is the tense for what happens regularly. When something is part of your routine, your week or your normal life, the present is the right choice, and fundir is no exception. The time words that go with it are todos los días, cada semana, siempre and a menudo.
Example: “Fundo el hierro en el horno.” — I melt iron in the furnace.
2. A general fact
The present tense also states facts that are true in general, not just today. When you describe what fundir means in the world — what it does, who it affects, how it works — the present is the tense to use. There is no time limit on the statement, so no past or future form is needed.
Example: “Funde el hielo con el calor.” — He/she melts ice with the heat.
3. Something happening right now
The present tense describes what is happening at this very moment. You do not need the progressive (estar plus the gerund) to say what is going on now: the simple present does the job in Spanish, and it is the more common choice in everyday speech.
Example: “Fundo dos empresas en una.” — I melt two companies into one.
4. A plan or arrangement
Spanish uses the present tense for plans that are already fixed, especially with a time expression such as mañana or el lunes. When the arrangement is made, the present tense states it as a fact, and fundir follows the same rule as every other verb.
Example: “Mañana, nosotros fundimos el queso en la pizza.” — Tomorrow, we melt cheese on the pizza.
5. Asking and answering questions
Questions in the present tense ask about routines, facts and what is happening now. The answer uses the same tense, so a question and its answer stay in the present together. This is the pattern you will hear most often in conversation.
Example: “¿Fundes el hielo con el calor?” — Do you melt ice with the heat?
The present vs the preterite: how to choose
The closest tense to the present is the preterite, and choosing between them is one of the first decisions in Spanish. The rule is simple: the present reports what happens now, what happens regularly, or what is generally true, while the preterite reports one finished action in the past. The three pairs below use the same verb, so the only thing that changes is whether the action is happening now or is already finished. Time words help: ahora and todos los días point to the present, while ayer and anoche point to the preterite.
Present: “Fundo el hierro en el horno.” — I melt iron in the furnace.
Preterite: “Fundí el hierro en el horno.” — I melted iron in the furnace.
The present sentence describes what happens now or regularly; the preterite sentence reports one finished action in the past. That difference — now versus finished — is the whole decision.
Present: “Funde el hielo con el calor.” — He/she melts ice with the heat.
Preterite: “Fundió el hielo con el calor.” — He/she melted ice with the heat.
The present sentence describes what happens now or regularly; the preterite sentence reports one finished action in the past. That difference — now versus finished — is the whole decision.
Present: “Fundimos dos empresas en una.” — We melt two companies into one.
Preterite: “Fundimos dos empresas en una.” — We melted two companies into one.
The present sentence describes what happens now or regularly; the preterite sentence reports one finished action in the past. That difference — now versus finished — is the whole decision.
Example sentences: fundir in the present
Read these eight sentences out loud. They cover all six persons, so by the end you will have seen every form in the table used in a real sentence. Pay attention to the words around the verb — the time expressions, the objects, the other verbs — because those are what make each sentence sound natural.
“Fundo el hierro en el horno.” — I melt iron in the furnace.
“Fundes el hielo con el calor.” — You melt ice with the heat.
“Funde dos empresas en una.” — He/she melts two companies into one.
“Fundimos el queso en la pizza.” — We melt cheese on the pizza.
“Fundís el hierro en el horno.” — You melt iron in the furnace.
“Funden el hielo con el calor.” — They melt ice with the heat.
“Fundo dos empresas en una.” — I melt two companies into one.
“Funde el queso en la pizza.” — He/she melts cheese on the pizza.
Common mistakes with fundir in the present
These are the errors learners actually make with this verb in this tense. Each one shows the wrong version, the right version, and why the correction matters.
Wrong: “Yo funde el hierro en el horno.” Right: “Yo fundo el hierro en el horno.” Why: Yo needs the yo form fundo. The form funde belongs with él, ella or Ud.
Wrong: “Yo fundir el hielo con el calor.” Right: “Yo fundo el hielo con el calor.” Why: The infinitive fundir cannot be the main verb of a sentence: it must be conjugated to agree with yo, giving fundo.
Wrong: “Ayer yo fundo el hielo con el calor.” Right: “Ayer yo fundí el hielo con el calor.” Why: The present tense cannot describe a finished action yesterday. Ayer forces the preterite, so the form must change to fundí.
Wrong: “Ellos funde el hielo con el calor.” Right: “Ellos funden el hielo con el calor.” Why: Ellos needs the ellos form funden. The singular funde belongs with él, ella or a singular noun.
Quiz: fundir in the present
Choose the correct answer for each question, then check the answer key. Every answer is explained, so a wrong answer still teaches you something.
1. Complete the sentence: “Yo ___ el hierro en el horno.”
- (a) fundo
- (b) fundes
- (c) funde
Answer: fundo — The yo form of fundir in the present is fundo.
2. Complete the sentence: “Tú ___ el hielo con el calor.”
- (a) fundo
- (b) funde
- (c) fundes
Answer: fundes — The tú form of fundir in the present is fundes.
3. Complete the sentence: “Él/ella ___ dos empresas en una.”
- (a) fundes
- (b) funde
- (c) fundo
Answer: funde — The él/ella form of fundir in the present is funde.
4. Complete the sentence: “Nosotros/as ___ el queso en la pizza.”
- (a) fundimos
- (b) fundo
- (c) fundes
Answer: fundimos — The nosotros/as form of fundir in the present is fundimos.
5. Complete the sentence: “Vosotros/as ___ el hierro en el horno.”
- (a) fundo
- (b) fundes
- (c) fundís
Answer: fundís — The vosotros/as form of fundir in the present is fundís.
6. Complete the sentence: “Ellos/ellas ___ el hielo con el calor.”
- (a) fundes
- (b) funden
- (c) fundo
Answer: funden — The ellos/ellas form of fundir in the present is funden.
7. What does fundir mean in English?
- (a) to melt, to merge
- (b) to melt
- (c) to be about
Answer: to melt, to merge — Fundir means to melt, to merge.
8. Which sentence is in the present?
- (a) Fundí el hierro en el horno.
- (b) Fundiré el hierro en el horno.
- (c) Fundo el hierro en el horno.
Answer: Fundo el hierro en el horno. — “Fundo el hierro en el horno.” is in the present. The other two use different tenses.
Frequently asked questions
Is fundir regular in the present?
Yes. Fundir is regular in the present: fundo, fundes, funde, fundimos, fundís and funden. Watch the accents on the forms that carry them, and remember that the nosotros form is the one that keeps the stem unchanged.
What is the gerund and the past participle of fundir?
The gerund is fundiendo, used with estar for the progressive: estoy fundiendo. The past participle is fundido, used with haber in the perfect tenses: he fundido.
What should I watch out for with fundir?
Fundir is regular: fundí, fundía, fundiré. In the present, the form to fix in your memory first is fundo, because the yo form shows the stem pattern for the whole tense.
How do I practise fundir in the present?
Say the six forms in the table out loud with the examples above, then use the fundir examples and quiz page for more sentences, and the Spanish Verb Quiz to test the forms under pressure.
Related pages
- Full conjugation of fundir — every tense of fundir in one place.
- Fundir examples and quiz — more sentences with fundir and a ten-question quiz.
- Spanish present guide — how the present works for all Spanish verbs.
- Spanish verbs — the hub for every Spanish verb on VerbFlow.
- Present tense conjugator — conjugate any verb in the present instantly.
- Verb quiz — test yourself on fundir and other verbs.