1. Lan is taller than Hoa.
=> Hoa is shorter than Lan.
2. I am bigger than my sister. 
=> My sister is smaller than me.
3. Jane cooks better than me.
=> I cook worse than Jane.
4. My mom is younger than my dad. 
=> My dad is older than my mother.
5. Nam is thinner than Minh. 
=> Minh is not as thin as Nam.
6. My father is heavier than me. 
=> I am not as heavy as my father.
7. That tree is higher than this tree. 
=> This tree is not as high as that tree.

8.My shirt is older than your shirt

=> Your shirt is newer than my shirt