Answer:
I think it is necessary.
Explanation:
Without the "a" it's like you're asking a question, when you add the "personal a" you're saying it as in you did that!
B. Sí, se acostaron temprano
1. what time is it?
2. it is midday
it is mid night
3. what time is art class ?
4. the science class is at 10:00
:)
What are you supposed to do