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.
In Spanish, the reflexive verb 'acostarse' is used to express 'to go to bed.' The correct form in this case is 'se acuestan,' which agrees with the subject 'ellos' (they).
Using the pronoun 'se' indicates that the action is being done by the subject 'ellos' themselves.
Learn more about Spanish