1. That shirt isn't as old as this one.

This shirt isn't as new as that one.

2. That film isn't as interesting as this one.

This film isn't as boring as that one.

3. That test isn't as difficult as this one.

This test isn't as easy as that one.

4. The country isn't as noisy as the city.

The city isn't as quiet as the country.

5. That car isn't as cheap as this one.

This car isn't as expensive as that one.

6. His house isn't as comfortable as mine.

My house isn't as uncomfortable as his.

7. Their bags aren't as convenient as his.

His bag isn't as inconvenient as theirs.

8. My sister doesn't write as well as me.

I don't write as badly as my sister does.

9. John’s friend doesn't sing English as badly as he does.

John doesn't sing English as well as his friend does.

10.  Linda’s brother doesn't drive his car as carefully as she does.

Linda doesn't drive her car as carelessly as his brother does.

11. Hoa’s mother doesn't knit as quickly as she does.

Hoa doesn't knit as slowly as her mother does.

12. Ba’s father doesn't walk as fast as he does.

He doesn't walk as slowly as his father does.