more expensive than
The spaceship bed is more expensive than the metal bed.
the cheapest
The wooden bed is the cheapest.
more comfortable than
The wooden bed is more comfortable than the metal bed.
harder than
The metal bed is harder than the wooden bed.
the worst
The metal bed is the worst.
the most expensive
The spaceship bed is the most expensive.
the hardest
The spaceship bed is the hardest.
worse than
The metal bed is worse than the wooden bed.
softer than
The wooden bed is softer than the metal bed.
the softest
The wooden bed is the softest.
cheaper than
Repairing the old bed is cheaper than buying a new one.
the best
Chocolate ice cream is the best.
the most comfortable
The wooden bed is the most comfortable.
better than
Ice cream is better than pizza!
the most modern
The spaceship bed is the most modern bed.
more modern than
The spaceship bed is more modern than the wooden bed.