costar Imperfect Subjunctive Conjugation
costar — to cost
The imperfect subjunctive of costar is regular: costara, costaras, costara, costáramos, costarais, costaran.
costar Imperfect Subjunctive Forms
When to Use the Imperfect Subjunctive
Use it in 'if' clauses (hypotheticals) or after past-tense verbs of emotion or doubt regarding cost or effort.
Notes on costar in the Imperfect Subjunctive
This tense is formed from the third-person plural of the preterite (costaron), so it remains regular with no stem change.
Example Sentences
Si el viaje costara menos, iría.
If the trip cost less, I would go.
él/ella/usted
Me gustaría que no costara tanto esfuerzo.
I would like it if it didn't take so much effort.
él/ella/usted
Si los libros costaran diez euros, compraría cinco.
If the books cost ten euros, I would buy five.
ellos/ellas/ustedes
Common Mistakes
Mistake: Adding a stem change (cuestara).
Correct: costara
Why: The imperfect subjunctive is based on the preterite stem, which is regular for costar.
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Related Tenses
Present
yo: cuesto
In the present tense, costar follows an o-to-ue stem change: cuesto, cuestas, cuesta, costamos, costáis, cuestan.
Preterite
yo: costé
The preterite of costar is regular: costé, costaste, costó, costamos, costasteis, costaron.
Imperfect
yo: costaba
The imperfect of costar is regular: costaba, costabas, costaba, costábamos, costabais, costaban.
Future
yo: costaré
The future of costar is regular: costaré, costarás, costará, costaremos, costaréis, costarán.
Conditional
yo: costaría
The conditional of costar is regular: costaría, costarías, costaría, costaríamos, costaríais, costarían.
Present Subjunctive
yo: cueste
The present subjunctive follows the o-to-ue stem change: cueste, cuestes, cueste, costemos, costéis, cuesten.
Affirmative Imperative
yo: cuesta
The imperative of costar uses the stem-changed 'cuesta' (tú) and 'cuesten' (ustedes).
Negative Imperative
yo: no cuestes
The negative imperative uses the present subjunctive: no cuestes, no cueste, no costemos, no costéis, no cuesten.