Correct sentence: The ambulance gives first aid and takes people to the hospital.
Why?
- "An ambulance" or "The ambulance": Say "An ambulance" when you mean any ambulance. Say "The ambulance" when you mean one specific ambulance you already talked about.
- "gives" and "takes": These present-tense verbs are correct for things ambulances do.
- "to the hospital": We usually add "the" before "hospital" to show it's a specific place. (In British English people sometimes say "to hospital," but "to the hospital" is clearer for learners.)
Past tense example: The ambulance gave first aid and took people to the hospital.
Try this: Change the sentence to plural — for example: Ambulances give first aid and take people to hospitals.