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Task 1:

1. We should invite the Nortons to our party. They are nice people.
2. Young children mustn't stay at home on their own.
3. Before you go to the dentist's, you should brush your teeth.
4. You mustn't smoke in bed!

    5.You should shut the windows because it is raining.

Task 2:

1. 
   At our school we have to wear a uniform.
2. You mustn't cross the roads without looking. It's dangerous.
3. You don't have to turn on the central heating. It's automatic.
4. The exams are next week. I must work harder.
5. You mustn't forget your umbrella. It's going to rain.
6. Students have to listen to the teacher or they won't understand.
7. You mustn't cross the road when the red light is showing.
8. We have to leave now or we'll miss the plane.
9. Soldiers must obey orders.
10. Sorry, I must go now. I don't want to be late.