10 предложений "что должны и не должны делать ученики в школе" (используя глаголы should и must)

1. You must not play in telephone when you are on the lesson. 2. You should do your tasks if your teacher wants it. 3. You should not tell rude words to your teacher. 4. You must visit the lessons. 5. You should be quiet and calm during the rest time. 6. You must not take the animals in school. 7. You should not talk on the lesson. 8. You should do your homework if you don't want bad marks. 9. You must be concentrated on lesson. 10. Teacher must explain the theme so you will understand it.