alterar Present Conjugation
alterar — to change
The present tense of alter (altero, alteras, altera, alteramos, alteráis, alteran) describes current actions, habits, or general truths.
alterar Present Forms
When to Use the Present
Use the present tense for things that are happening right now ('Ahora altero los datos'), things you do regularly ('Generalmente altero el programa'), or general facts ('El clima altera el ánimo').
Notes on alterar in the Present
Alter is a regular -ar verb in the present indicative. The conjugation follows the standard pattern.
Example Sentences
Yo altero el orden de las prioridades.
I change the order of priorities.
yo
¿Tú alteras las fechas a menudo?
Do you change the dates often?
tú
Ella altera el contenido del informe.
She changes the content of the report.
él/ella/usted
Nosotros alteramos el plan cada semana.
We change the plan every week.
nosotros
Ellos alteran las reglas del juego.
They change the rules of the game.
ellos/ellas/ustedes
Common Mistakes
Mistake: Using 'estar' + gerund for habitual actions.
Correct: For habits, use the simple present: 'Siempre altero eso', not 'Siempre estoy alterando eso'.
Why: The present progressive ('estar' + gerund) emphasizes an action in progress, while the simple present is used for habits and general truths.
Mistake: Confusing 'alterar' with 'alternar'.
Correct: 'Alterar' means to change or disturb; 'alternar' means to alternate or take turns.
Why: These are common false friends. Learners might mix them up due to similar spelling and sound.
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Related Tenses
Preterite
yo: alteré
The preterite of alter is regular: alteré, alteraste, alteró, alteramos, alterasteis, alteraron.
Imperfect
yo: alteraba
The imperfect of alter (alteraba, alterabas, alteraba, alterábamos, alterabais, alteraban) describes ongoing or habitual past actions.
Future
yo: alteraré
The future tense of alter (alteraré, alterarás, alterará, alteraremos, alteraréis, alterarán) indicates actions that will happen.
Conditional
yo: alteraría
The conditional of alter (alteraría, alterarías, alteraría, alteraríamos, alteraríais, alterarían) expresses hypotheticals ('would') and polite requests.
Present Subjunctive
yo: altere
The present subjunctive of alter (altere, alteres, alteremos, alteréis, alteren) is used after expressions of will, doubt, emotion, and uncertainty.
Imperfect Subjunctive
yo: alterara
The imperfect subjunctive of alter (alterara/alterase) is used for past hypotheticals, wishes, or polite requests.
Affirmative Imperative
yo: altera
Alter commands are mostly regular: ¡altera, altere, alteremos, alterad, alteren!
Negative Imperative
yo: no alteres
Negative commands for alter are formed with 'no' + present subjunctive: no alteres, no altere, no alteremos, no alteréis, no alteren.