Questions & Answers about Врач спешит в больницу.
Why does the word for hospital change to больницу here?
Because it is the destination of the action. When indicating movement 'to' a place, Russian uses the Accusative case. The dictionary form is больница, and feminine nouns ending in -а change their ending to -у in the Accusative case.
Why use the preposition в instead of на for the hospital?
We use в (meaning 'into' or 'to') for enclosed spaces, buildings, and most standard locations. A hospital is a physical building you go inside, so it takes в. The preposition на is mostly used for open areas, surfaces, or events.
How would I ask 'Where is the doctor hurrying?' based on this sentence?
You would ask Куда спешит врач? using the question word куда ('where to'). You must use куда instead of где ('where at') because the doctor is actively moving toward a destination, rather than just standing still somewhere.