Work in pairs. Complete the sentences with your own ideas.
For the world to be a peaceful place, ...
1. we should ...
2. we shouldn’t ...
3. we must ...
4. we mustn’t ...
5. we don’t have to ...
To be in a good mood every day, ...
6. you should ...
7. you shouldn’t ...
8. you have to ...
9. you don’t have to ...




