1. Hoa is not as tall as Lan
-Hoa is shorter than Lan
2. My sister is smaller than I am
-My sister is't as big as I am
3. My dad is older than my mom
-My dad isn't as young as my mom
4. Minh is fatter than Nam
-Minh isn't as thin as Nam
5. I am lighter than my father
-I am not as heavy as my father
6. Those trees are not as high as these trees
-Those trees are shorter than these trees
7. Your shirt isn't as old as mine
-Your shirt (sao lại là tree) is newer than mine
8. Those exercises are esasier than these exercises
9. The life in the countryside isn't as comfortable as the life in the city