Rewrite the following sentences without changing the meaning.
37. We need to bring flashlights to see at night.
→ We need to bring flashlights so
38. It’s not a good idea to go diving along because it’s quite dangerous.
→ You
39. It’s necessary for you to drink plenty of water when you’re out in the sun all day.
→ You
40. It’s a good idea to have a guidebook before you visit a city.
→ You