9. What did she do in the school yard yesterday?

10. I watched TV/ played football/...

11. Please. Don't make noise in the class.

12. Khoa is the most intelligent student in our class.

13. If we use the car all the time, we will make the air dirty.

14. This is the first time Nam has been to the stadium for a

football match.

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9. What did she play in the school yard yesterday? 
11. Please. Don't make noise . ( Làm ơn. Đừng làm ồn )
12. Khoa is the most intelligent student in our class. ( so sánh nhất : the most + adj)
13. If we don't use the car all the time, we will make the air dirty. ( câu điều kiện loại 1 : S + V..., S + will V)
14. This is the first time Nam has been to the stadium for a football match. ( this is the first time + HTHT)