kite surfing is cheaper than sailing
--> sailing is
skating is easier than skiing
--> skiing is
vietnamese is more difficult than maths
--> maths is
snowboarding is more dangerous than skiing
--> skiing is
her lunch is better than mine
--> my lunch is
the kitchen is dirtier than the bathroom
--> the bathroom is
the science books are heavier than the texts
--> the texts
oranges are sweeter than grapefruits
--> grapefruits
mona's hair is curlier than camile's hair
--> camile's hair is
this exercise is longer than that exercise
--> that exercise
kite surfing is cheaper than sailing
--> sailing is more expensive than kite surfing
skating is easier than skiing
--> skiing is more difficult than skating
vietnamese is more difficult than maths
--> maths is easier than Vietnamese
snowboarding is more dangerous than skiing
--> skiing is not so dangerous as snowboarding
her lunch is better than mine
--> my lunch is not as good as hers
the kitchen is dirtier than the bathroom
--> the bathroom is cleaner than the kitchen
the science books are heavier than the texts
--> the texts are not as heavy as the science books
oranges are sweeter than grapefruits
--> grapefruits are not as sweet as oranges
mona's hair is curlier than camile's hair
--> camile's hair is not as curly as Mona's hair
this exercise is longer than that exercise
--> that exercise is shorter than this exercise