* It's not a good idea to swim immediately after a meal.
* You should wait at least an hour before swimming.
* Hoặc: Swimming right after eating can be dangerous.
* It's really important to take this medicine three times a day.
* You must remember to take this medicine three times a day as prescribed.
* Hoặc: Don't forget to take your medicine as directed.
* It's a good idea to listen to the weather forecast before going camping.
* You should always check the weather forecast before any outdoor activities.
* Hoặc: Knowing the weather forecast will help you prepare for your camping trip.
* It's good for you to take exercise every day.
* You should try to exercise for at least 30 minutes a day.
* Hoặc: Regular exercise is important for your health.
* It's very important not to drink the water there. It will make you ill.
* You must avoid drinking the water there. It's contaminated.
* Hoặc: That water is unsafe to drink. Find another source of water.
* It's not good to eat lots of sweets.
* You shouldn't eat too many sweets. They're bad for your teeth.
* Hoặc: Eating too much sugar can lead to health problems.
* It's against the rules to use your mobile phone in class.
* You must turn off your phone during class.
* Hoặc: Using your phone in class is disrespectful to the teacher and your classmates.