1.Rock music is more exciting than classical music (boring)

= classical music is more boring than rock music

2. travelling by plane is faster than travelling by coach

= travelling by coach is slower than travelling by plane

3. chinese is more difficult than english

= english is easier than chinese

4. everest mount is higher than fanxipan.

= fanxipan is lower than everest mount.

xin hay nhất nhé !!!

$\text{1. Classical music is more boring than rock music.}$
$\text{2. Travelling by coach is slower than travelling by plane.}$
$\text{3. English is easier than Chinese.}$
  $\text{ English isn't as difficult as Chinese.}$
$\text{4. Fanxipan is shorter than Everest Mount.}$
  $\text{ Fanxipan isn't as high as Everest Mount.}$