1. This exercise is easier than that one.
=> That exercise is more difficult than this one .
2. The black car is cheaper than the red car.
=> The red car is more expensive than the black car.
3. This film is more interesting than that one.
=> That film is more boring than this one.
4. This river is longer than that one.
=> That river is  shorter than this one

5. Miss Lan is older than Miss Nga.

=> Miss Nga is younger than Miss Lan.
 

6. My kitchen is smaller than yours.
=> Your kitchen bigger than mine.
7. Her old house is bigger than her new one.
=> Her new house is  smaller than her old one.
8. The black dress is more expensive than the white one.
=> The white dress is cheaper than the black one.
9. According to me, English is easier than Maths.
=> According to me, Maths is more difficult than English
10. This computer works better than that one.
=> That computer works worse than this one.

   giải thích : S+ to be + more +adj+ than + S2