sustituir Conditional Conjugation
sustituir — to replace
The conditional is regular: add -ía endings to the infinitive 'sustituir'.
sustituir Conditional Forms
When to Use the Conditional
Use this to express what you 'would replace' if you had the money, or to make a polite suggestion about a substitution.
Notes on sustituir in the Conditional
Sustituir is regular in the conditional. Like the imperfect, all forms have an accent on the 'í'.
Example Sentences
Yo sustituiría ese sofá si tuviera dinero.
I would replace that sofa if I had money.
yo
¿Sustituirías tú tu teléfono por uno más viejo?
Would you replace your phone with an older one?
tú
Common Mistakes
Mistake: Confusing the conditional 'sustituiría' with the imperfect 'sustituía'.
Correct: sustituiría
Why: The conditional keeps the 'r' from the infinitive before the ending.
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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).
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.
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.