Confusing 'con' and 'por'

Missing the 'Y' in the 'doing' form

For verbs like this that end in -uir, the letter 'i' changes to a 'y' when it's between two vowels. This is why you say 'sustituyo' instead of 'sustituio'.

The 'Y' Rule

When you are swapping one thing for another, use the word 'por' to introduce the new item: 'Sustituyo A por B'.

Using 'Por'

These are almost identical! 'Sustituir' is slightly more common in technical or cooking contexts, while 'reemplazar' is very common for people and general physical objects.

Sustituir vs. Reemplazar

Very common in both daily conversation and professional settings when talking about swapping or replacing things or people.

Learn how to use the Spanish verb 'sustituir' (to replace/substitute). Includes full conjugation tables, spelling rules, and common phrases.

Sustituir Meaning & Conjugation | InkLingo Dictionary

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

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

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

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

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

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

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

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

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

sustituir

Complete Conjugation Tables

🔄 Conjugations

subjunctive

imperfect

present

imperative

negative

affirmative

indicative

conditional

preterite

imperfect

present

future

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