Degree

An adjective can exist in three forms. 1.Positive, 2.Comparative, 3.Superlative

Degrees of comparison

Positive	Comparative	Superlative
Sweet	Sweeter	Sweetest
Old	Older	Oldest
High	Higher	Highest
Young	Younger	Youngest
Large	Larger	Largest
Easy	Easier	Easiest
Happy	Happier	Happiest
Heavy	Heavier	Heaviest
Big	Bigger	Biggest
Difficult	More difficult	Most difficult
Important	More important	Most important
Bad	Worse	Worst
Good	Better	Best

 Positive degree: The form of an adjective which depicts a noun or pronoun's quality, flaw or state is called positive degree.
     Example:  1. Raju is a good boy
                       2. No other boy in the class is as tall as he.

Comparative degree: The form of adjective which compares two nouns or pronouns quality, flaw or state is called comparative degree.
     Example: 1. Hasan is better than his cousin.
                      2. She is more beautiful than any other girl in the class.

Superlative degree: The form of adjective which is used to compare among many is called superlative degree.
      Example: 1. It is the most important topic of this subject.
                       2. He is the best boy in the class.

Rules of changing forms of degree 

 Superlative to Positive: 1. If you need to transfer from superlative to positive then the structure of below will be followed.
 No other+ Object+ Verb+ as+ positive form+ as+ Subject.
    Example: She is the best student in our class.
                 => No other student in our class is as good as she.

 2. If there is ''One of the'' in a sentence then this structure will be followed.  Very few+ Object(plural)
+ Verb(plural)+ as+ Positive form+ as+ Subject.
     Example: He is one of the best boy in the class.
                  => Very few boys in the class are as good as he.

Comparative to positive: 1. If there is a word "than" in a sentence then the structure of the below will be followed.
 Object+ auxiliary verb+ not+ main verb+ as+ positive form+ as+ subject
   Example: She is more beautiful than her sister.
               => Her sister is not as beautiful as she.

 2. If there is "Than any other" in a sentence then the structure of below will be followed.
 No other+ Object+ verb+ as+ positive form+ as+ Subject.
     Example: The Padma is larger than any other river in Bangladesh.
                 => No other river is as large as the Padma in Bangladesh.

 3. If there is "Than most other" in a sentence then the structure of below will be followed.
 Very few+ Object(plural)+ verb(plural)+ as+ positive form+ as+ subject
     Example: Truthfulness is greater than most other virtue.
                 => Very few virtues are as great as truthfulness.

Superlative to Comparative:  1.If you need to change the form superlative to comparative then the structure of below will be followed.
 Subject+ verb+ comparative form+ than+ any other+ Object.
      Example: It is the most difficult task.
                  => It is more difficult than any other task.

 2. If there is "one of the" in a sentence then this structure will be followed. Subject+ verb+ comparative form+ than most other+ object
     Example: The cow is one of the most useful animal.
                 => The cow is more useful than most other animal.