obstrueras

Obstrueras is a Spanish verb form belonging to the verb obstruir, meaning to obstruct or impede. It is the second-person singular form of the imperfect subjunctive (pretérito imperfecto de subjuntivo) used in subordinate clauses to express hypothetical, uncertain, or past-oriented circumstances, as well as in conditional constructions.

Formation and variants: The imperfect subjunctive has two conventional endings sets: -ra and -se. For a verb like obstruir, the -ra form appears as obstruyera / obstruyeras in most varieties, with related forms such as obstruyéramos, obstruyerais, obstruyeran. The -se variant yields forms like obstruyese, obstruyeres, obstruyese, obstruésemos, obstruyeseis, obstruyesen. Because obstruir ends with -uir, the stem often takes a y- before the endings (for example, obstruyera and obstruyera, with the corresponding tú form obstruyeras). Dialectal or editorial differences can produce alternate spellings in certain texts.

Usage: The imperfect subjunctive is used in clauses that report a request, doubt, emotion, or wish in the past, or in hypothetical or contrary-to-fact conditions. It commonly appears after expressions like si (if) examples, or after verbs of necessity, desire, or doubt when referring to past time. For instance: Si tú obstruyeras el paso, podríamos avanzar; No creía que tú obstruyeras la entrada sin autorización. In formal address, corresponding forms of other persons align with the same mood and endings.

See also: obstruir, pretérito imperfecto de subjuntivo, and other verb forms in the same conjugation family.