obstruir Imperfect Subjunctive Conjugation
obstruir — to block
Based on the 3rd person preterite, it uses the 'y' stem: obstruyera, obstruyeras, obstruyera...
obstruir Imperfect Subjunctive Forms
When to Use the Imperfect Subjunctive
Use this for hypothetical situations ('If you blocked the road...') or past requests involving an obstruction.
Notes on obstruir in the Imperfect Subjunctive
The 'y' from the preterite (obstruyeron) carries over into every form of the imperfect subjunctive.
Example Sentences
Si yo obstruyera el paso, me multarían.
If I blocked the way, they would fine me.
yo
El policía pidió que no obstruyéramos el tráfico.
The police officer asked that we didn't block traffic.
nosotros
Me gustaría que ellos no obstruyeran mi vista.
I would like them not to block my view.
ellos/ellas/ustedes
Common Mistakes
Mistake: obstruiera
Correct: obstruyera
Why: The 'i' changes to 'y' when it falls between two vowels (o-i-e becomes o-y-e).
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Related Tenses
Present
yo: obstruyo
Obstruir adds a 'y' in most forms: obstruyo, obstruyes, obstruye, obstruyen (but not nosotros/vosotros).
Preterite
yo: obstruí
Obstruir is irregular in the 3rd person (él/ellos), changing 'i' to 'y': obstruyó, obstruyeron.
Imperfect
yo: obstruía
Obstruir is regular in the imperfect: obstruía, obstruías, obstruía, obstruíamos, obstruíais, obstruían.
Future
yo: obstruiré
Obstruir is regular in the future: obstruiré, obstruirás, obstruirá, obstruiremos, obstruiréis, obstruirán.
Conditional
yo: obstruiría
Obstruir is regular in the conditional: obstruiría, obstruirías, obstruiría, obstruiríamos, obstruiríais, obstruirían.
Present Subjunctive
yo: obstruya
Obstruir adds a 'y' before the endings in all forms: obstruya, obstruyas, obstruya, obstruyamos, obstruyáis, obstruyan.
Affirmative Imperative
yo: obstruye
Give commands using the 'y' forms: obstruye (tú), obstruya (usted), obstruyan (ustedes).
Negative Imperative
yo: no obstruyas
All negative commands use the present subjunctive: no obstruyas, no obstruya, no obstruyamos...