Los muchachos perezosos ____________________ a las once y media.

“Los muchachos” means “the boys,” so the subject is third-person plural. The reflexive pronoun for ellos is “se,” and the verb “despertarse” changes its stem from e to ie in the present tense: “se despiertan.” Therefore, the sentence is “Los muchachos perezosos se despiertan a las once y media,” meaning “The lazy boys wake up at eleven thirty.”

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