about superlative and comparative degree usage

Quiet, quieter, quietest.

Rule no. 1 Count the number of letters.  If there are 6 letters or more than 6 letters, add more and most to change the degree.

Difficult    More difficult   Most difficult

Beautiful  More beautiful Most beautiful

Rule no. 2: If there are 3 letters, repeat the last consonant letter and add "er" and "est" for Comparative and Superlative degree respectively.

Fat=3 letters Comparative is Fatter and Superlative is Fattest

Red= 3 letters Comparative is Redder and Superlative is Reddest

Hot= 3 letters Comparative is Hotter and Superlative is Hottest

1.Important more important and most important.

2. useful, more useful and most useful.

Rule no. 3: If consonant "y" is used at the end of the word, "ier" and "iest" are used to change the degree.

Wealthy     Wealthier             Wealthiest

Heavy         Heavier                 Heaviest

Rule no 4: The adjectives ending with "e" take "r" and "st" to change the degree.

Able        Abler            Ablest

Wise        Wiser           Wisest

Noble     Nobler          Noblest

Rule no.5: Generally Adjectives take 'er" or "est" to change the  degree.

Great            Greater          Greatest

Kind              Kinder            Kindest

No use of "er" and "est" in Regular adjectives:

In case, there is one person and his own two qualities are compared:

She is more kind than clever.

Irregular adjectives have no rules.  Only you have to learn by heart.