1. An elephant is heavier than a tiger.
An elephant is less dangerous than a tiger.
A tiger is fiercer than an elephant.
An elephant isn't as fast as a tiger.
A car is more expensive than a bicycle.
A bicycle is cheaper than a car.
A car isn't as slow as a bicycle.
A bicycle is more comfortable than a car.
3. A dog is friendlier than a cat.
A cat is quieter than a dog.
A dog is more intelligent than a cat.
A cat isn't as playful as a dog.