Los padres de Juan temen que él _____________ de noche.

The phrase “temen que” expresses fear or uncertainty, so it is followed by the subjunctive. The present subjunctive form of “salir” for “él” is “salga,” making the sentence “Los padres de Juan temen que él salga de noche” (“Juan’s parents are afraid that he goes out at night”). “Salir” is the infinitive, and “saldremos” means “we will go out,” so neither fits here.

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