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Adjectives are words that are used to describe the noun. Now, let's take a look at comparison adjectives. Adjectives change in "form" show comparison.
Positive adjectives are adjectives in a simple form, and they do not express any comparison.
Comparative adjectives are used to compare two objects/persons.
Superlative adjectives are used to compare more than two objects/persons.
Consider the following:
  1. John is a strong man.
  2. David is stronger than John.
  3. Martin is the strongest of all the three men.
Statement 1 shows that John is strong - this is called Positive degree.
Statement 2 brings in a comparison standard to show David is stronger - this is called Comparative degree.
Statement 3 brings about a comparison to say that Martin is the strongest - this is called Superlative degree.
strong.JPG
 
Important!
The superlative degree can also be used when there is no comparison. For example, I'm the most fortunate person today! It simply means the quality of a high degree.
Formation of Comparative and Superlative from positive adjectives by following simple rules:
 
Condition
Positive adjective
Comparative
Superlative
Adjective Add 'er'Add 'est'
 
Sweet
Sweeter
Sweetest
 
Strong
Stronger
Strongest
Adjectives
ending in 'e'
 Add 'r'Add 'est'
 
Noble
Nobler
Noblest
 
Brave
Braver
Bravest
Adjectives
ending in 'y'
 
Remove 'y'
add 'ier'
Remove 'y'
add 'iest'
 
Wealthy
Wealthier
Wealthiest
 
Happy
Happier
Happiest
Adjective
in one syllable
 Double the last consonant and add 'er'Double the last consonant and add 'est'
 
Hot
Hotter
Hottest
 
Fat
Fatter
Fattest
Adjective
with more than two syllable
 Prefix 'more'prefix 'most'
 
Useful
More useful
Most useful
 DifficultMore difficultMost difficult
 
Courageous
More courageous
Most courageous
Important!

It has to be noted that, to compare two qualities in the same object/person, 'er' cannot be used in the comparative. For example, These mangoes are more sour than sweet. Here two qualities of the same mango are discussed. Therefore 'er' is avoided and 'more' is used. In general comparison, it would have been "These mangoes are sweeter than apples".

Next, let's take a look at Irregular comparison. These adjectives do not fall in any of the above rules and are not formed from the positive adjective.
GoodBetterthe best
BadWorsethe worst
FarFartherthe farthest
LittleLessthe least
LateLater, Latterthe latest
OldOlder, elderthe oldest, the eldest
FarFurtherthe farthest
  
For a better understanding, examine the following with examples:
 
I. Good-better-best:
Example:
1. Ram is good in studies.
2. Rahim is better than Jack in studies.
3. Rosy is the best of all the students in the class.
II. Late-later-latest: Later and latest refer to time, latter and last refer to position.
Example:
1. John is late for school.
2. Mary is later than I expected.
3. You should be updated with the latest news.
4. The latter pages of the book were torn.
5. My school building is the last one on this street.
III. Old-Older/Elder-Oldest/Eldest: Elder/eldest is used for persons only and not for objects. Elder is used with "to" and not with "than". Older/oldest can be used for both objects and persons. 
Example:
1. My brother is five years old.
2. My brother is five years older than me/ My brother is five years elder to me.
3. My brother is the eldest of the three / My brother is the oldest of the three.
4. We visited the oldest buildings to see the architecture.
IV. Far-further-farthest: Used to describe distances.
Example:
1. He lives far from the city.
2. Jack lives further down the city.
3. We had chosen the farthest point to finish our race.
Some of the comparative adjectives from the lesson are:
1. The ogre is more seriously wounded than I am!
2. After hitting his head on the windmill, Don Quixote become even more disoriented.
3. But we need more adventures Sancho.
4. Don Quixote never embarrass himself further by going on any more quests.
Some of the superlative adjectives from the lesson are:
1. His house will always be full of children to whom he would tell the most fantastic stories about Knights, Squires and Noble quests.
2. Don Quixote eager to be the best chivalrous knight.