1. When two items/people are compared, a comparative degree is used by putting ‘er’ to the adjective word in association with the word ‘than’. In some cases ‘more’ is used.
Ex : She is smarter than her sister.
2. Similarly, when more than two things/people are compared, the superlative degree is used by putting ‘est’ to the adjective word or in some cases ‘most’ is used.Ex :
Ex He is the strongest wrestler.
3. Do not use double comparative adjectives or superlative adjectives.
Incorrect – These mangoes are more tastier than those.
Correct – These mangoes are tastier than those.