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
You can try using an english to spanish dictionary, it helps you pick up spanish easier when you see the english word next to it :)
Answer:
B. escribes
Explanation:
Hope this helps! Good luck! :)
