sustituir Affirmative Imperative Conjugation
sustituir — to replace
Give commands to replace things: sustituye (tú), sustituya (usted), sustituyamos (nosotros).
sustituir Affirmative Imperative Forms
When to Use the Affirmative Imperative
Use this to tell someone to swap one thing for another, like a recipe instruction or a workplace task.
Notes on sustituir in the Affirmative Imperative
The 'tú' form is 'sustituye' (with a 'y'), while the formal 'usted' and 'ustedes' forms also use the 'y' from the subjunctive.
Example Sentences
Sustituye el cable antes de encenderlo.
Replace the cable before turning it on.
tú
Sustituyan los términos del contrato.
Replace the terms of the contract.
ustedes
Common Mistakes
Mistake: Using 'sustitui' for the tú command.
Correct: sustituye
Why: The affirmative tú command usually matches the third-person singular of the present indicative.
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Related Tenses
Present
yo: sustituyo
Sustituir is irregular in the present tense, adding a 'y' before the ending in most forms: sustituyo, sustituyes, sustituye, sustituyen.
Preterite
yo: sustituí
In the preterite, sustituir changes 'i' to 'y' in the third-person forms: sustituyó and sustituyeron.
Imperfect
yo: sustituía
Sustituir is regular in the imperfect: sustituía, sustituías, sustituía, sustituíamos, sustituíais, sustituían.
Future
yo: sustituiré
The future of sustituir is regular: just add endings to the infinitive (sustituiré, sustituirás).
Conditional
yo: sustituiría
The conditional is regular: add -ía endings to the infinitive 'sustituir'.
Present Subjunctive
yo: sustituya
The present subjunctive follows the 'yo' form of the present indicative, adding a 'y': sustituya, sustituyas, etc.
Imperfect Subjunctive
yo: sustituyera
The imperfect subjunctive is built from the 'sustituyeron' stem: sustituyera, sustituyeras, etc.
Negative Imperative
yo: no sustituyas
Negative commands use the present subjunctive forms: no sustituyas, no sustituya.