• 
  
  You shouldn't spend a lot of time watching TV.
• 
  Antarctica is the coldest place in the world.
• 
  Why don't we go to Times Square to welcome the New Year?
• 
  A1 car is less convenient than a bicycle in towns.   
•  
• 
  You shouldn't swim immediately after a meal.
• 
  You must take this medicine three times a day.
• 
  You should listen to the weather forecast before going camping.
• 
  You should take exercise every day.
• You mustn't drink the water there. It will make you ill.

First Set:

1. You shouldn't spend a lot of time watching TV.
2. Antarctica must be colder than any other place in the world.
3. Why don't we go to Times Square to welcome the New Year?
4. A car shouldn't be used as a more convenient mode of transport in towns.

Second Set:

1. You shouldn't swim immediately after a meal.
2. You must take this medicine three times a day.
3. You should listen to the weather forecast before going camping.
4. You should take exercise every day.
5. You mustn't drink the water there. It will make you ill.

1. You shouldn't spend a lot of time watching TV.
2. Antarctica is the coldest place in the world.
3. Why don't we go to Times Square to welcome the New Year?
4. A car is less convenient than a bicycle in towns.   

1. You shouldn't swim immediately after a meal.
2. You must take this medicine three times a day.
3. You should listen to the weather forecast before going camping.
4. You should take exercise every day.
5. You mustn't drink the water there. It will make you ill.