sustituir Present Subjunctive Conjugation
sustituir — to replace
The present subjunctive follows the 'yo' form of the present indicative, adding a 'y': sustituya, sustituyas, etc.
sustituir Present Subjunctive Forms
When to Use the Present Subjunctive
Use this after expressions of doubt, desire, or commands, such as 'Espero que sustituyan el vidrio roto'.
Notes on sustituir in the Present Subjunctive
The 'y' appears in all forms of the present subjunctive, including nosotros and vosotros.
Example Sentences
Es importante que sustituyas las pilas.
It's important that you replace the batteries.
tú
Dudo que ellos sustituyan al jefe.
I doubt that they will replace the boss.
ellos/ellas/ustedes
Common Mistakes
Mistake: Writing 'sustitua' instead of 'sustituya'.
Correct: sustituya
Why: The 'y' is necessary to maintain the correct pronunciation and follows the irregular stem of the 'yo' form.
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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'.
Imperfect Subjunctive
yo: sustituyera
The imperfect subjunctive is built from the 'sustituyeron' stem: sustituyera, sustituyeras, etc.
Affirmative Imperative
yo: sustituye
Give commands to replace things: sustituye (tú), sustituya (usted), sustituyamos (nosotros).
Negative Imperative
yo: no sustituyas
Negative commands use the present subjunctive forms: no sustituyas, no sustituya.