a. Hoa is taller than Mai
⇒ Mai is shorter than Hoa
b. This buiding is bigger than that buiding
⇒ That buiding is smaller than this buiding
c. My house is smaller than your house
⇒ Your house is bigger than my house
d. Nam is fatter than Ba
⇒ Ba is thinner than Nam
e. This ruler is longer than that ruler
⇒ That ruler is shorter than this ruler