✓ "Something came up." → An unexpected situation arose. (intransitive — no object)
✓ "She came up with a great idea." → She thought of / invented an idea. (inseparable — needs object)
✗ "She came up a great idea." → WRONG — you must include "with."
📖 Ana's Hometown Visit
Ana had been living in San José for two years when she decided to come back to her hometown of Liberia for a long weekend. She missed her family deeply.
When she arrived, her mother called out: "Come in, the food is ready!" That afternoon, her childhood friend Valeria decided to come over and surprise her. It felt wonderful.
The next morning, something unexpected came up: Ana's little brother Rodrigo had come down with a bad cold and couldn't leave his room. Ana sat with him and they talked for hours.
Later, Valeria invited Ana to come along to the local market. There, Ana came across a woman selling the same handmade jewelry she had admired as a child. She bought a bracelet. A new Costa Rican film had just come out, so the friends went to see it that evening.
On her last day, Ana came up with a plan: she would visit every two months. The weekend had come off beautifully — much better than she had expected. She said goodbye to her mother and began the long drive back to the city, her heart full.