Corrected sentences:
A rescue helicopter helps from the sky. It can find people in the mountains and on the water, and it can help put out forest fires.
Why these changes? (Simple steps)
- We start with "A rescue helicopter" instead of just "The rescue helicopter" so it sounds like we are talking about any rescue helicopter.
- We keep "helps from the sky" because that shows where the helicopter helps.
- When listing things it can do, we join them with "and". So we say "find people in the mountains and on the water" to show two places it can find people.
- We add "it can" before "help put out forest fires" to make the sentence clear and complete.
Nice work — your sentences were already very good! These small changes make them sound a bit clearer.