A Positive adjectives are basically the original form of an adjective. Positive adjectives do not allow you to make any comparison. It only gives you the information about a particular quality possessed by a noun.
B Comparative adjectives are used to compare differences between the two objects they modify. For example, they are used in sentences where two nouns are compared.
C Superlatives adjectives can be used to highlight superiority, inferiority and equality while comparatives are only used to highlight extremes such as superiority and inferiority.
D Comparatives adjectives may vary depending on the number of syllables in an adjective. They may also present irregular comparative forms.
E E. Superlative adjectives are used to describe an object which is at the upper or lower limit of a quality. They are used in sentences where a subject is compared to a group of objects.