Questions & Answers about Hablé con mi nieto.
Spanish often leaves out subject pronouns because the verb ending already tells you who the subject is.
- hablé already means I spoke
- so yo hablé is usually unnecessary
You can add yo for emphasis, contrast, or clarity:
- Yo hablé con mi nieto, no con mi hija.
I spoke with my grandson, not with my daughter.
So Hablé con mi nieto is perfectly natural.