The correct verb in Infinitive Form to fill the sentence is:
NadarInfinitive Form in Spanish.The infinitive form is characterized by the endings -ar, -er, or -ir in Spanish, it is usually used when another conjugated verb has already been used. In the case of the given sentence, its translation into Spanish is:
A los niƱos les gusta _____ en la piscina.A verb that is closely linked to the word "piscina" in Spanish is "nadar," since it is the most common action carried out in those places, therefore, this verb is the correct option.
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