8th English : Unit 2 : Grammar:Degrees of comparison:Notes of lesson There are three ways to compare. That is positive, comparative and superlative. These are known as degrees of comparison. Now, let us see how the word 'fast' changes to show us how fast each of them run. The ostrich runs fast. The deer runs faster than the ostrich. The cheetah is the fastest of all. We can see that the adjective 'fast' is changing form to show how fast each of them run in comparison to the other. So, the cheetah, the fastest of all will win the race. We add - er with the adjective to make it comparative and - est to make it superlative.