| Should | Shouldn't |
| You should be polite. | You shouldn't be late. |
| You should be kind and helpful. | You shouldn't fight with your classmates. |
| You should work hard. | You shouldn't throw rubbish anywhere. |
| You should protect desks and chairs. | You shouldn't hurt trees and flowers. |
| You should keep the classroom clean. | You shouldn't write words on desks and walls. |
