Underline the correct word e.g. He is doing/making a special dish. 11. They do/make muffins on Saturdays. 12. Tom is playing/plays basketball every Sunday morning. 13. Pete and Nick are going/go windsurfing at the moment. 14. Paul went/goes to the theatre yesterday. 15. You must/can't wear a uniform when you're at school. 16. Students don't have to/have to wash the windows. The cleaners will do it. 17. How much did/do you usually pay per month? 18. I think she is most/more clever than her brother. 19. That is the taller/tallest boy in the class. 20. Can/must I go outside, please?

Решение:

1. They make muffins on Saturdays. (Для приготовления еды обычно используется глагол 'make').
2. Tom plays basketball every Sunday morning. (Глагол в Present Simple, третье лицо, единственное число).
3. Pete and Nick are going windsurfing at the moment. (Действие происходит прямо сейчас, используется Present Continuous).
4. Paul went to the theatre yesterday. (Действие произошло вчера, используется Past Simple).
5. You mustn't wear a uniform when you're at school. (Это правило или запрет, используется 'mustn't').
6. Students don't have to wash the windows. The cleaners will do it. (Нет необходимости что-то делать, т.к. это сделают другие).
7. How much did you usually pay per month? (Слово 'much' используется с неисчисляемыми существительными, например 'money' (подразувается)).
8. I think she is more clever than her brother. (Сравнительная степень прилагательного 'clever' с 'than').
9. That is the tallest boy in the class. (Превосходная степень прилагательного 'tallest', т.к. сравнивается один объект со всей группой).
10. Can I go outside, please? (Просьба или разрешение, используется 'can').

Ответ: make; plays; going; went; mustn't; don't have to; much; more; tallest; Can.