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Complete Conjugation Tables

Reference all tenses and moods

Subjunctive

Imperfect Subjunctive

yoalterara
alteraras
él/ella/ustedalterara
nosotrosalteráramos
vosotrosalterarais
ellos/ellas/ustedesalteraran

The imperfect subjunctive of alter (alterara/alterase) is used for past hypotheticals, wishes, or polite requests.

Present Subjunctive

yoaltere
alteres
él/ella/ustedaltere
nosotrosalteremos
vosotrosalteréis
ellos/ellas/ustedesalteren

The present subjunctive of alter (altere, alteres, alteremos, alteréis, alteren) is used after expressions of will, doubt, emotion, and uncertainty.

Imperative

Negative Imperative

no alteres
ustedno altere
nosotrosno alteremos
vosotrosno alteréis
ustedesno alteren

Negative commands for alter are formed with 'no' + present subjunctive: no alteres, no altere, no alteremos, no alteréis, no alteren.

Imperative

altera
ustedaltere
nosotrosalteremos
vosotrosalterad
ustedesalteren

Alter commands are mostly regular: ¡altera, altere, alteremos, alterad, alteren!

Indicative

Conditional

yoalteraría
alterarías
él/ella/ustedalteraría
nosotrosalteraríamos
vosotrosalteraríais
ellos/ellas/ustedesalterarían

The conditional of alter (alteraría, alterarías, alteraría, alteraríamos, alteraríais, alterarían) expresses hypotheticals ('would') and polite requests.

Preterite

yoalteré
alteraste
él/ella/ustedalteró
nosotrosalteramos
vosotrosalterasteis
ellos/ellas/ustedesalteraron

The preterite of alter is regular: alteré, alteraste, alteró, alteramos, alterasteis, alteraron.

Imperfect

yoalteraba
alterabas
él/ella/ustedalteraba
nosotrosalterábamos
vosotrosalterabais
ellos/ellas/ustedesalteraban

The imperfect of alter (alteraba, alterabas, alteraba, alterábamos, alterabais, alteraban) describes ongoing or habitual past actions.

Present

yoaltero
alteras
él/ella/ustedaltera
nosotrosalteramos
vosotrosalteráis
ellos/ellas/ustedesalteran

The present tense of alter (altero, alteras, altera, alteramos, alteráis, alteran) describes current actions, habits, or general truths.

Future

yoalteraré
alterarás
él/ella/ustedalterará
nosotrosalteraremos
vosotrosalteraréis
ellos/ellas/ustedesalterarán

The future tense of alter (alteraré, alterarás, alterará, alteraremos, alteraréis, alterarán) indicates actions that will happen.

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Frequently Asked Questions

What does alterar mean in Spanish?

alterar means "to change".

Is alterar a regular or irregular verb?

alterar is a regular -ar verb in Spanish.

How do you conjugate alterar in the present tense?

The present tense of alterar is: yo altero, tú alteras, él/ella/usted altera, nosotros alteramos, vosotros alteráis, ellos/ellas/ustedes alteran.

How do you conjugate alterar in the preterite (past tense)?

The preterite of alterar is: yo alteré, tú alteraste, él/ella/usted alteró, nosotros alteramos, vosotros alterasteis, ellos/ellas/ustedes alteraron.

Free printable reference

alterar conjugation cheat sheet

alterar conjugation cheat sheet — present, preterite, imperfect, future and conditional forms