Introduction

Reaccionar means “to react”, and this page covers exactly one thing: reaccionar in the present tense. The present is the tense Spanish speakers reach for when they talk about what happens regularly and what is happening now. On this page you will find the full present table for reaccionar, how the tense is formed for this verb, the situations where it is used, how it differs from the preterite, worked examples, the mistakes learners make most often, an eight-question quiz with explained answers, and answers to the questions students ask about reaccionar in the present. Reaccionar in the present describes a habit, a fact or something happening right now. For example: “Yo reacciono rápido” — "I react quickly". Everything on this page uses the forms of reaccionar exactly as they are conjugated in the present, so you can trust every form you see here.

Reaccionar in the Present Tense — full table

Person Form
yo reacciono
tú reaccionas
él/ella/Ud. reacciona
nosotros/as reaccionamos
vosotros/as reaccionáis
ellos/ellas/Uds. reaccionan

Gerund: reaccionando · Past participle: reaccionado

The gerund is reaccionando, which you use with estar to say what is happening right now: “Estoy reaccionando” means the action of reaccionar is in progress at this very moment. The past participle is reaccionado, which you use with haber in the perfect tenses: “he reaccionado” 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 reaccionar is used.

How the present of reaccionar is formed

Reaccionar is a regular -ar verb in the present. Take the stem reaccion and add the present endings for -ar verbs: -o, -as, -a, -amos, -áis, -an, giving reacciono, reaccionas, reacciona, reaccionamos, reaccionáis, reaccionan. Watch the accents: the vosotros form, reaccionáis, carries an accent on the á, é or í. The present of reaccionar is fully regular, but two details deserve attention. First, the accents: the vosotros form reaccionáis carries a written accent. Second, the yo form reacciono is the form the present subjunctive is built from, so learn it well — it unlocks the subjunctive too.

When to use the present of reaccionar

The present is not a single-purpose tense. Below are the five situations where you will use reaccionar in the present most often. Each one comes with a real example, so read the rule, then say the example out loud.

1. Routines and habits

The present is the tense of what you do regularly. When something happens todos los días, cada semana or los fines de semana, reaccionar goes in the present. Example: “Yo reacciono con calma” — "I react calmly".

2. General facts

Use the present for things that are true in general, not just today. A fact about reaccionar does not need a time word at all. Example: “Él reacciona ante la noticia” — "He reacts to the news".

3. What is happening now

The present also covers what is happening at this very moment. Spanish often uses the simple present where English would use the -ing form, so reacciono can mean both "I react" and "I am reacting". Example: “Yo reacciono rápido” — "I react quickly".

4. Timetables and fixed plans

For a fixed plan or a timetable, Spanish uses the present: the plan is already decided, so the present states it as a fact. This is common with travel, lessons and appointments. Example: “Nosotros reaccionamos con calma” — "We react calmly".

5. Telling a story

Stories are sometimes told in the present to make them feel immediate, even when they happened in the past. This is the historical present, and it works with reaccionar just as it does with any other verb. Example: “Él reacciona ante la noticia” — "He reacts to the news".

Present Tense vs 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 regularly or what is happening now, 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 a habit or a finished event. Time words help: todos los días and cada semana point to the present, while ayer and la semana pasada point to the preterite.

  • Present Tense: “Yo reacciono rápido” — "I react quickly".

  • Preterite: “Yo reaccioné rápido” — "I reacted quickly".

  • The present sentence describes a habit or something happening now; the preterite sentence reports one finished action in the past. That difference — routine versus finished event — is the whole decision.

  • Present Tense: “Él reacciona con calma” — "He reacts calmly".

  • Preterite: “Él reaccionó con calma” — "He reacted calmly".

  • The present sentence describes a habit or something happening now; the preterite sentence reports one finished action in the past. That difference — routine versus finished event — is the whole decision.

  • Present Tense: “Nosotros reaccionamos ante la noticia” — "We react to the news".

  • Preterite: “Nosotros reaccionamos ante la noticia” — "We reacted to the news".

  • The two sentences look identical: reaccionamos is the same in the present and the preterite. Only the time words around it tell you which tense is meant.

Example sentences: reaccionar 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.

  1. “Yo reacciono con calma” — "I react calmly"

  2. “Tú reaccionas ante la noticia” — "You react to the news"

  3. “Él reacciona rápido” — "He reacts quickly"

  4. “Nosotros reaccionamos con calma” — "We react calmly"

  5. “Vosotros reaccionáis ante la noticia” — "You react to the news"

  6. “Ellos reaccionan rápido” — "They react quickly"

  7. “Yo reacciono con calma” — "I react calmly"

  8. “Él reacciona ante la noticia” — "He reacts to the news"

Common mistakes with reaccionar 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: “Ellos reacciona rápido” Right: “Ellos reaccionan rápido” Why: Ellos needs the ellos form reaccionan. The singular reacciona belongs with él, ella or a singular noun.

  • Wrong: “Todos los días, yo reaccioné” Right: “Todos los días, yo reacciono” Why: Todos los días describes a habit, so the present is right. The preterite (reaccioné) is for one finished action, not for routines.

  • Wrong: “Yo reacciona rápido.” Right: “Yo reacciono rápido” Why: Yo needs the yo form reacciono. The él form reacciona belongs with él, ella or a singular noun.

  • Wrong: “Ayer, yo reacciono” Right: “Ayer, yo reaccioné” Why: The present tense cannot describe a finished action yesterday. Ayer forces the preterite, so the form must change to reaccioné.

Quiz: reaccionar 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 ___ ante la noticia.” (yo form)

A. reacciono B. reaccionamos C. reaccionáis D. reaccionan

2. Complete the sentence: “Tú ___ rápido.” (tú form)

A. reaccionas B. reaccionáis C. reaccionan D. reacciono

3. Complete the sentence: “Él ___ con calma.” (él/ella/Ud. form)

A. reacciona B. reaccionamos C. reaccionan D. reacciono

4. Complete the sentence: “Nosotros ___ ante la noticia.” (nosotros/as form)

A. reaccionamos B. reaccionáis C. reacciona D. reaccionas

5. Complete the sentence: “Vosotros ___ rápido.” (vosotros/as form)

A. reaccionamos B. reacciono C. reaccionan D. reaccionáis

6. Complete the sentence: “Ellos ___ con calma.” (ellos/ellas/Uds. form)

A. reaccionan B. reacciona C. reaccionamos D. reacciono

7. Which time expression points to the present tense?

A. todos los días B. ayer C. la semana pasada D. anoche

8. Which sentence is correct?

A. Todos los días, yo reacciono B. Todos los días, yo reaccioné

Answer key

  1. reacciono — The yo present of reaccionar is reacciono.
  2. reaccionas — The tú present of reaccionar is reaccionas.
  3. reacciona — The él/ella/Ud. present of reaccionar is reacciona.
  4. reaccionamos — The nosotros/as present of reaccionar is reaccionamos.
  5. reaccionáis — The vosotros/as present of reaccionar is reaccionáis.
  6. reaccionan — The ellos/ellas/Uds. present of reaccionar is reaccionan.
  7. todos los días — Todos los días describes a habit, so the present is right. Ayer, la semana pasada and anoche all point to the preterite.
  8. Todos los días, yo reacciono — Todos los días is a habit, so the present is correct. The preterite is for one finished action.

Frequently asked questions

When do I use the present of reaccionar?

Use the present for routines, general facts and what is happening now. For example: Yo reacciono rápido. If the action is a habit or happening now, the present is the right choice.

How is the present of reaccionar formed?

Take the stem reaccion- and add the present endings for -ar verbs (-o, -as, -a, -amos, -áis, -an), giving reacciono, reaccionas, reacciona, reaccionamos, reaccionáis, reaccionan.

What is the difference between the present and the preterite for reaccionar?

The present (reacciono) describes a habit or something happening now, while the preterite (reaccioné) counts one finished action in the past. Compare the two sentences in the contrast section above: the verb is the same, only the tense changes.

How can I practise reaccionar in the present?

Say the six forms out loud — reacciono, reaccionas, reacciona, reaccionamos, reaccionáis, reaccionan — then use them in the example sentences above, changing the person each time. Then try the reaccionar examples and quiz page, and the full conjugation of reaccionar when you want to compare the present with the other tenses.

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