good -> ... -> ...
better -> the best
... -> easier -> ...
easy -> easier -> the easiest
What can a mountain be?
low and high
... -> worse -> ...
bad -> worse -> the worst
... -> ... -> the most difficult
difficult -> more difficult
dangerous -> ... -> ...
more dangerous -> the most dangerous
What can mobile phones be?
expensive and cheap
The girl is ... the boy. (tall)
as tall as
The first girl is ... the second girl. (happy)
as happy as
A party can be ...
exciting or boring
expensive -> ... -> ...
more expensive -> the most expensive
happy -> ... -> ...
happier -> the happiest
great -> ... -> ...
greater -> the greatest