Final answer:
The best Spanish equivalent to the phrase 'They go to bed at ten o'clock' is 'Ellos se acuestan a las diez.'
Step-by-step explanation:
The best Spanish equivalent to the phrase 'They go to bed at ten o'clock' is 'Ellos se acuestan a las diez.' The verb 'acostarse' means 'to go to bed,' and 'ellos' means 'they.' The reflexive pronoun 'se' is used to indicate that the action of going to bed is being done by the subject themselves. The phrase 'a las diez' means 'at ten o'clock,' specifying the time.
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