No pensaba que el forastero trabajara aquí.

Questions & Answers about No pensaba que el forastero trabajara aquí.

Why do we use the imperfect subjunctive trabajara instead of the indicative trabajaba?
In Spanish, negated verbs of thinking or believing, like no pensaba (I didn't think), trigger the subjunctive because they express doubt or a lack of certainty. Since the main verb (pensaba) is in a past tense, the second verb must be in a past subjunctive tense. That is why we use the imperfect subjunctive trabajara.
How exactly do we form trabajara from the infinitive trabajar?
To form the imperfect subjunctive, you always start with the ellos/ellas form of the preterite (simple past), which is trabajaron. Then, you drop the -ron to get the stem (trabaja-) and add the imperfect subjunctive endings. For el forastero (he), the ending is -ra, giving us trabajara.
Could I say trabajase instead of trabajara?
Yes, absolutely. The imperfect subjunctive has two valid sets of endings: -ra and -se. You will hear both in Spain, and trabajase means the exact same thing as trabajara. However, the -ra endings are generally much more common in everyday speech.
The word for stranger here is forastero. Could I use extranjero or desconocido?
It depends on the exact context. Forastero usually means an outsider from another town or region. If the stranger is from another country, you would use extranjero (foreigner). If you are referring to a random person on the street whose identity you don't know, desconocido (unknown person) is the best fit.

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