Theory:

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.
 
Strong.png
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
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 Superlative from positive adjectives by following simple rules:
 
Condition
Positive adjective
Superlative
Adjective 
Add 'est'
 SweetSweetest
 StrongStrongest
Adjectives ending in 'e' Add 'est'
 NobleNoblest
 BraveBravest
Adjectives ending in 'y' Remove 'y' add 'iest'
 WealthyWealthiest
 HappyHappiest
Adjective in one syllable Double the last consonant and add 'est'
 HotHottest
 FatFattest
Adjective with more than two syllable Prefix 'most'
 UsefulMost useful
 DifficultMost difficult
 Courageous
Most courageous
Some of the superlative adjectives from the lesson "Desert Animals" are:
  1. Camel is the tallest animal in the desert.
  2. Gerbil is the smallest mammal.
  3. Python has the longest tail.
  4. Which place on the earth is the hottest?
  5. Which animal is the largest in nature?
  6. Which animal is the fastest in nature?
  7. Mongoose has the longest tail.
 
Important!
Click here for an extensive list of adjectives.