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