Avoid 'dedujieron'

When talking about the past (completed actions), the 'c' in deducir changes to a 'j'. For example, 'I deduced' is 'Yo deduje', not 'deducí'.

The 'c' to 'j' swap

When saying 'I deduce' (Present tense), we add a 'z' before the 'c' to keep the sound right: 'Yo deduzco'.

The 'z' in the Present

To explain HOW you figured something out, use 'por'. Example: 'Lo deduje por su reacción' (I deduced it by his reaction).

Use it with 'por'

Commonly used in daily life when talking about logical conclusions and in academic contexts.

While both mean to take away money, 'deducir' is usually used for formal things like taxes or salaries, while 'descontar' is used for store discounts.

Deducir vs. Descontar

If you are talking about 'tax-deductible', the adjective is 'deducible'. Example: 'Es un gasto deducible' (It is a deductible expense).

Business context

Very common in banking, taxes, and business conversations.

Learn how to use 'deducir' in Spanish. Includes full conjugation tables, examples for logical inference and financial deduction, and common mistakes to avoid.

Deducir: Meaning, Conjugation, and Examples | Inklingo

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The conditional of deducir is regular: deduciría, deducirías, deduciría.

The future tense of deducir is regular: deduciré, deducirás, deducirá.

Use 'deduce' for tú and 'deduzca' for formal commands.

The imperfect of deducir is completely regular: deducía, deducías, deducía.

The imperfect subjunctive uses the 'j' stem from the preterite: dedujera, dedujeras, dedujera.

The negative imperative always uses the 'z' stem: no deduzcas, no deduzca.

The present tense of deducir uses a 'zc' spelling change in the yo form: yo deduzco.

The present subjunctive uses the 'z' from the yo form throughout: deduzca, deduzcas, deduzca.

The preterite of deducir is irregular, using a 'j' stem: deduje, dedujiste, dedujo.

deducir

Complete Conjugation Tables

🔄 Conjugations

subjunctive

imperfect

present

imperative

negative

affirmative

indicative

conditional

preterite

imperfect

present

future

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