Questions & Answers about Мой брат делится опытом с сестрой.
Russian has two different verbs here:
- делить что-то (non‑reflexive) = to divide, to split something
- Он делит пирог. – He is dividing the cake.
- делиться чем‑то (с кем‑то) (reflexive, with -ся) = to share something (with someone), to open up, to tell about something
In Мой брат делится опытом с сестрой, we mean My brother shares his experience with his sister, not My brother divides experience. So Russian must use the reflexive verb делиться, not делить.
The form делится is:
- 3rd person singular
- present tense
- of the verb делиться: он дели́тся – he shares.