I'm not very good on explaining this but I'll give you an example or more than one.
Antonio y yo nos besamos.
Antonio and I kissed each other.
¿Os conocéis?
Do you all know each other?
Juan y María se casaron.
Juan and Maria got married (to each other).
Los estudiantes se ayudan.
The students help each other.
I hope it helped
4. Ustedes conocen a todos los vecinos?
Answer:
Mi hermano y yo somos graciosos.
Explanation:
Answer:
Tienen.
Explanation:
Lucía y Martha tienen el pelo castaño.
