`1`. You must do more exercise to keep fit.

`2`. She shouldn't eat so many sweet things.

`3`. You should take this medicine three times a day.

`4`. You should go camping in the mountain.

`5`. You should take exercise every day.

`6`. You mustn't drink the water there, it will make you ill.

`7`. She musn't eat lots of sweets.

`8`. You shouldn't swim immediately after a meal.

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`1`. S + must + V-inf: phải làm gì

`2`. S + must not + V-inf: không được làm gì

`3`. S + should + V-inf: nên làm gì

`4`. S + should not + V-inf: không nên làm gì

1. You must do execises to keep

2. She shouldn't to eat so many sweet things.

3. You to take this medicine three times a day 

4. You not a good idea ro go camping in the mountain.

5. You right of you to take execise every day.

6. You very important not to drink the water there, you will make you ill.

7. She wrong of her to ate lots of sweets.

8. You a bad idea to swim immediately after a meal.