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Complete conjugation tables and interactive practice exercises for the Spanish verb '{infinitive}' ({translation}). Master all tenses and moods with our conjugation trainer.

The Spanish verb '{infinitive}' meaning '{translation}'.

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<strong>Verb conjugation</strong> is the backbone of Spanish communication. Every sentence you speak or write requires at least one conjugated verb, and getting it right determines whether you sound fluent or confused.

The good news: Spanish has clear patterns. Regular -ar, -er, and -ir verbs follow predictable rules, and the 20 most common irregular verbs cover the vast majority of everyday conversation. Master those, and you''re already ahead of most learners.

Past, present, future, hypothetical — conjugations let you place actions exactly when they happened or might happen.

Wrong conjugations can change who did what. ''Hablé'' (I spoke) vs ''habló'' (he spoke) — one accent mark, completely different meaning.

DELE, AP Spanish, and university placement tests all heavily test conjugation accuracy. It''s the most testable skill in Spanish.

When conjugation becomes automatic, you stop translating in your head and start thinking directly in Spanish. That''s true fluency.

Spanish has 14 major verb tenses across 3 moods (indicative, subjunctive, imperative), but just 3 tenses — present, preterite, and imperfect — account for over 80% of verbs used in everyday speech. Focus there first.

Why Mastering Conjugations Is Essential

Sustituir is irregular in the present tense, adding a 'y' before the ending in most forms: sustituyo, sustituyes, sustituye, sustituyen.

In the preterite, sustituir changes 'i' to 'y' in the third-person forms: sustituyó and sustituyeron.

Sustituir is regular in the imperfect: sustituía, sustituías, sustituía, sustituíamos, sustituíais, sustituían.

The conditional is regular: add -ía endings to the infinitive 'sustituir'.

The present subjunctive follows the 'yo' form of the present indicative, adding a 'y': sustituya, sustituyas, etc.

The imperfect subjunctive is built from the 'sustituyeron' stem: sustituyera, sustituyeras, etc.

Give commands to replace things: sustituye (tú), sustituya (usted), sustituyamos (nosotros).

Negative commands use the present subjunctive forms: no sustituyas, no sustituya.

The future of sustituir is regular: just add endings to the infinitive (sustituiré, sustituirás).

sustituir Future Conjugation

sustituir Future Forms

When to Use the Future

Notes on sustituir in the Future

Example Sentences

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Related Tenses

Present

Preterite

Imperfect

Conditional

Present Subjunctive

Imperfect Subjunctive

Affirmative Imperative

Negative Imperative