Alterar Examples, Sentences & Quiz in Spanish

alterar means “to alter, to disturb” in English, and this page shows you how it actually sounds in everyday Spanish — not just the conjugation table, but the verb in real sentences, in short dialogues, and in the mistakes learners make with it. Alterar means to alter or to disturb, to change something from its normal state, such as plans, order or someone's calm. It is a fully regular verb used in everyday life, work and medicine. Below you will find twelve example sentences grouped by tense, two short dialogues, the most common mistakes with corrections, and a ten-question quiz with explained answers. If you want the full tables first, start with the full conjugation of alterar; if you want to study one tense in depth, see the alterar present tense page.

alterar in everyday use: examples with translations

In the present tense

  1. Yo altero los planes del viaje. — “I alter the travel plans.”
  2. Él altera el orden de la casa. — “He alters the order of the house.”
  3. Nosotros alteramos la calma del barrio. — “We alter the calm of the neighbourhood.”
  4. Ellos alteran el resultado del análisis. — “They alter the result of the test.”

In the past

  1. Ayer, yo alteré el orden de la casa. — “Yesterday, I altered the order of the house.”
  2. Antes, nosotros alterábamos la calma del barrio. — “Before, we used to alter the calm of the neighbourhood.”
  3. Él alteró el resultado del análisis. — “He altered the result of the test.”
  4. Yo ya había alterado los planes del viaje antes de salir. — “I had already altered the travel plans before leaving.”

Plans, hopes and possibilities

  1. Mañana, tú alterarás los planes del viaje. — “Tomorrow, you will alter the travel plans.”
  2. Yo alteraría el orden de la casa si tuviera más tiempo. — “I would alter the order of the house if I had more time.”
  3. Él ha alterado la calma del barrio. — “He has altered the calm of the neighbourhood.”
  4. Espero que él altere el resultado del análisis. — “I hope he alters the result of the test.”

alterar in conversation

Two short dialogues that use alterar the way people really speak it. Notice how the verb changes with the person, and how the same verb fits different situations.

Two friends talk about their day.

  • Ana: Yo altero los planes del viaje. — “I alter the travel plans.”
  • Bea: Él altera el orden de la casa. — “He alters the order of the house.”
  • Ana: Ayer, yo alteré el orden de la casa. — “Yesterday, I altered the order of the house.”
  • Bea: Mañana, tú alterarás los planes del viaje. — “Tomorrow, you will alter the travel plans.”

At home, talking about tomorrow.

  • Luis: Nosotros alteramos la calma del barrio. — “We alter the calm of the neighbourhood.”
  • Marta: Antes, nosotros alterábamos la calma del barrio. — “Before, we used to alter the calm of the neighbourhood.”
  • Luis: Yo alteraría el orden de la casa si tuviera más tiempo. — “I would alter the order of the house if I had more time.”
  • Marta: Espero que él altere el resultado del análisis. — “I hope he alters the result of the test.”

A short scene with alterar

A short scene shows how alterar works across the day. In the morning: Altero los planes del viaje. In the afternoon: Altera el orden de la casa. Yesterday it was different: Ayer, alteré la calma del barrio. And tomorrow: Mañana, alteraré el resultado del análisis. Four small moments, four tenses, one verb — that is how alterar sounds in real life. Try changing the person in each sentence: say it about yourself, about a friend, and about your family, and the forms will start to feel automatic.

Common mistakes with alterar

The errors learners actually make with alterar, each with the wrong form, the right form, and why the right form is right.

✗ Yo altera los planes del viaje.

✓ Correct: Yo altero los planes del viaje.

The person matters: altera is the él/ella/Ud. form, while the yo form is altero. Using the third-person form with yo is one of the most common beginner errors.

✗ Ayer yo altero el orden de la casa.

✓ Correct: Ayer yo alteré el orden de la casa.

The present and the preterite are different tenses: altero is happening now, while alteré is a finished action in the past. Use the preterite with ayer.

✗ Treating alterar and cambiar as identical in every context.

✓ Correct: Alterar means to alter, to disturb, while cambiar means to change.

They overlap, but each has uses the other does not: alterar fits sentences such as Altero los planes del viaje, while cambiar belongs in a different sentence. Check the meaning you want before choosing.

✗ Yo soy alterado el orden de la casa.

✓ Correct: Yo he alterado el orden de la casa.

Spanish perfect tenses use haber, not ser: he alterado, has alterado, ha alterado. Ser plus the participle makes a passive, not a perfect tense.

✗ De niño, yo alteré la calma del barrio todos los días.

✓ Correct: De niño, yo alteraba la calma del barrio todos los días.

For a repeated habit in the past, use the imperfect (alteraba), not the preterite. The preterite (alteré) is for one finished action.

Quiz: alterar in use

Ten questions on alterar — its forms, its tenses and its everyday use. Choose the best answer for each one, then check the answer key below, where every answer is explained.

1. Complete the sentence: Él ______ el orden de la casa. — “He/she alters the order of the house.”

  • a) altera
  • b) altero
  • c) alteras
  • d) alteramos

2. Complete the sentence: Ayer, yo ______ la calma del barrio. — “Yesterday, I altered the calm of the neighbourhood.”

  • a) alteraste
  • b) alteró
  • c) alteraron
  • d) alteré

3. Complete the sentence: Ellos ______ el resultado del análisis cuando eran jóvenes. — “They used to alter the result of the test when they were young.”

  • a) alterabas
  • b) alterábamos
  • c) alteraban
  • d) alteraba

4. Complete the sentence: Mañana, nosotros ______ los planes del viaje. — “Tomorrow, we will alter the travel plans.”

  • a) alterarán
  • b) alteraremos
  • c) alteraré
  • d) alterarás

5. Complete the sentence: Él ______ el orden de la casa si pudiera. — “He would alter the order of the house if he could.”

  • a) alteraría
  • b) alterarías
  • c) alteraríamos
  • d) altero

6. Complete the sentence: Yo ______ la calma del barrio. — “I have altered the calm of the neighbourhood.”

  • a) has alterado
  • b) ha alterado
  • c) han alterado
  • d) he alterado

7. Complete the sentence: Espero que tú ______ el resultado del análisis. — “I hope you alter the result of the test.”

  • a) alteremos
  • b) altero
  • c) alteres
  • d) altere

8. Which is the past participle of alterar, used with haber in the perfect tenses?

  • a) alteré
  • b) alterado
  • c) alterando
  • d) altero

9. What does alterar mean in English?

  • a) to alter, to disturb
  • b) to change
  • c) to allude to
  • d) to light up

10. Which sentence is correct?

  • a) Él altera el orden de la casa.
  • b) Él altero el orden de la casa.
  • c) Nosotros altera la calma del barrio.
  • d) Yo altera los planes del viaje.

Answer key

  1. a) altera — The sentence needs the él/ella/Ud. form in the present: altera.

  2. d) alteré — The sentence needs the yo form in the preterite: alteré, for one finished action yesterday.

  3. c) alteraban — The sentence needs the ellos/ellas form in the imperfect: alteraban, for a repeated past habit.

  4. b) alteraremos — The sentence needs the nosotros form in the future: alteraremos.

  5. a) alteraría — The sentence needs the él/ella/Ud. form in the conditional: alteraría.

  6. d) he alterado — The sentence needs the yo form in the present perfect: he alterado, haber + alterado.

  7. c) alteres — After espero que, the subjunctive is required: the tú present subjunctive is alteres.

  8. b) alterado — The past participle is alterado: he alterado, has alterado, ha alterado. The gerund alterando is used with estar instead.

  9. a) to alter, to disturb — alterar means to alter, to disturb. The other options are the meanings of different verbs.

  10. a) Él altera el orden de la casa. — Él altera el orden de la casa. is correct: the verb agrees with its subject. The other sentences mix up the person and the form.

Frequently asked questions

How do I use alterar in everyday conversation?

Start with the phrases in the examples above — especially the common combinations such as Altero los planes del viaje and Altera el orden de la casa. Use the present tense for habits and general facts, and the preterite for things that happened once. Say the sentences aloud until the forms feel automatic, then swap in your own details: your own town, your own family, your own routine.

What is the difference between alterar and cambiar?

Alterar means “to alter, to disturb”, while cambiar means “to change”. They are related words that learners often meet together, but they are not interchangeable — use alterar when you mean “to alter, to disturb” and cambiar when you mean “to change”.

Which tense do I need most with alterar?

The present tense, for habits, routines and general facts — that is where you will use alterar most. The preterite comes next, for things that happened once and ended. The examples on this page use both, plus the imperfect, the future and the present perfect, so you can see the verb across the tenses you actually need.

Is alterar formal or informal?

Alterar is neutral — it is used in both formal and informal Spanish, at home, at work and at school. There is no special formal version of it; the same forms work in a conversation with a friend and in a letter to a company. What changes is the situation, not the verb.

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