1. The oolong tea is not as expensive as the lipton tea.

2. Vinh is not as tall as Hai.

3. Mary is not as big as her last year.

4.

5. Your bike is not as expensive as mine.

6. Tom doesn't try as hard as his brother.

7. The boy doesn't run as fast as he did. 

8. Mai's family doesn't play the violin as good as Mai.

9. The summer isn't as hot as it was.