endurecer Preterite Conjugation
endurecer — to harden
The preterite of endurecer is regular: endurecí, endureciste, endureció, endurecimos, endurecisteis, endurecieron.
endurecer Preterite Forms
When to Use the Preterite
Use the preterite for specific moments in the past when something became hard or a person became strict suddenly.
Notes on endurecer in the Preterite
Endurecer is regular in the preterite. It follows the standard -er verb endings for past completed actions.
Example Sentences
El cemento se endureció en dos horas.
The cement hardened in two hours.
él/ella/usted
Endurecí el entrenamiento después de la primera semana.
I made the training tougher after the first week.
yo
Los jefes endurecieron las reglas ayer.
The bosses toughened the rules yesterday.
ellos/ellas/ustedes
Common Mistakes
Mistake: El pan se endurezo.
Correct: El pan se endureció.
Why: Learners often try to carry the 'z' from the present tense 'endurezco' into the preterite, but it isn't needed here.
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Related Tenses
Present
yo: endurezco
The present tense of endurecer is irregular in the 'yo' form: endurezco.
Imperfect
yo: endurecía
The imperfect of endurecer is regular: endurecía, endurecías, endurecía, endurecíamos, endurecíais, endurecían.
Future
yo: endureceré
The future of endurecer is regular: endureceré, endurecerás, endurecerá, endureceremos, endureceréis, endurecerán.
Conditional
yo: endurecería
The conditional of endurecer is regular: endurecería, endurecerías, endurecería, endureceríamos, endureceríais, endurecerían.
Present Subjunctive
yo: endurezca
The present subjunctive of endurecer uses the 'zc' stem: endurezca, endurezcas, endurezca, etc.
Imperfect Subjunctive
yo: endureciera
The imperfect subjunctive of endurecer is formed from the third-person plural preterite: endureciera.
Affirmative Imperative
yo: endurece
The imperative of endurecer uses 'endurece' (tú) and 'endurezca' (usted).
Negative Imperative
yo: no endurezcas
The negative imperative always uses the present subjunctive forms: no endurezcas, no endurezca.