Si no tuviera cuidado, podría caerme cuando cayera la lluvia.
If I wasn't careful, I could fall when the rain fell.
Context: daily life Era imposible predecir que la economía cayera tan rápido.
It was impossible to predict that the economy would fall so quickly.
Context: economy El árbol cayera durante la tormenta, causando daños en la casa.
The tree fell during the storm, causing damage to the house.
Context: environment