Answer:Since the subject of the sentence must be either singular (book) or plural (books), the only forms of gustar you will use are “gusta” and “gustan.”
The answer is Gustar is most often conjugated in the third person singular or plural, gusta or gustan, and matches what comes after the verb, rather what comes in front of it. If a verb in the infinitive follows gusta, indicating that someone like to do something, use the singular form, gusta
