The Comparative Degree

The zebra is big.

But the elephant is bigger than the zebra.

The tortoise is slow.

But the snail is slower than the tortoise.

The cow is fat.

But the hippo is fatter than the cow.

The car is heavy.

But the bus is heavier than the car.

The train is fast.

But the airplane is faster than the train.

The grandfather is old.

But the great-grandfather is older than the grandfather.

The student is clever.

But the professor is cleverer than the student.

The basketball player is strong.