Question

change the degree - "Harris is the most interesting commentator that I have ever heard

Answer 1

Harris is an interesting commentator that I have ever heard. (declarative)
Harris is more interesting than ay other commentator that i have ever heard. (comparitive)
Hope it helps you...

Answer 2

Tall is an adjective in the positive degree. Here we are comparing the height of two people with a positive adjective. If John and Mike are of the same height, Mike is not taller thanJohn.

See how the same idea is expressed using both positive and comparative adjectives.

John is as tall as Mike. = Mike isnot taller than John.

Another example is given below

Very few countries in the world are as large as China. (Positive)China is larger than most other countries in the world. (Comparative)China is one of the largestcountries in the world. (Superlative)No other man was as strong asHercules. (Positive)Hercules was stronger than any other man. (Comparative)Hercules was the strongestman in the world. (Superlative)No other boy in the class is as intelligent as James. (Positive)James is more intelligent thanany other boy in the class. (Comparative)James is the most intelligentboy in the class. (Superlative)