Positive is your only talking about only one thing/person/animal Ex:my bag is big Comparative is your comparing or talking about two things/person/animals Ex:her bag is bigger than mine Superlative is your talking about three or more than things/person/animals Ex:your bag is the biggest among all our bags Rules: If positive base form If comparative add er If superlative add est (For regular) Change the spelling or same (For irregular)

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The 3 degrees of comparison in english is positive (no comparison is made), comparative (2 persons or objects compared), and superlative (3 or more objects are compared). 

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