Rewrite these sentences using must, mustn't, should, shouldn't, have to or don't have to.

Example: Parking in this street is prohibited.

        You mustn't park in this street.

1) It's not a good idea to swim immediately after a meal.

 You   immediately after a meal.

2) (Doctor to patient) It's really important to take this medicine three times a day.

You   this medicine three times a day.

3) Is it necessary for me to do this exercise?

    this exercise?

4) It's Saturday tomorrow, so it's not necessary for me to get up early.

 It's Saturday tomorrow, so I don't   get up early.

5) It's a good idea to listen to the weather forecast before you go hill walking.

You    to the weather forecast before you go hill walking.

6) I can recommend this book to you - I think you would like it a lot.

You   this book - I think you would like it a lot.

7) It's a good idea to have a medical check-up every two years.

You    a medical check-up every two years.

8) It's very important not to drink the water there. It will make you ill.

You   the water there.

9) Is it really necessary for us to finish the work today?

 finish the work today?

10) Did the teacher tell you to see him tomorrow?

 see the teacher tomorrow?