Comparatives vs Superlatives

Comparatives

Use: 

Use the comparative form to talk about how two things are different.
I am taller than you.
This book is thicker than that one.

Form: 

1) If an adjective has one syllable, add er to the end. If it ends in e already, just add r.
tall   =>  taller     nice  =>  nicer
thick  =>  thicker    late  =>  later

2) If an adjective ends in one vowel and one consonant, write the consonant again, then write er. But never write a w twice.
big   =>  bigger     new   =>  newer (NOT newwer) thin  =>  thinner    slow  =>  slower (NOT slowwer) slim  =>  slimmer
My brother is thinner than me.

3) If an adjective has two syllables and ends in y, change the y to i and add er.
funny   =>  funnier     silly   =>  sillier
Which of these books is funnier?

5) Some adjectives have irregular superlative forms. These are listed below.
good  =>  better
bad   =>  worse
far   =>  further 

Add than after a comparative adjective to compare one thing with another. However, this is not always necessary.
My house is smaller than yours. 

Superlatives

Use: 

Use the superlative form to describe something that is greater than any other thing.
The Amazon is the longest river in the world.
Helen is the most intelligent student in the class.

Form:
1)            Write the before all superlatives.

2)            If an adjective is short and has one syllable, add est to the end. If it ends in e already, just add st.
                tall          =>           the tallest                           nice        =>           the nicest
                thick      =>           the thickest                        late        =>           the latest

2)            If an adjective ends in one vowel and one consonant, write the consonant again, then write est. But never write a w twice.
                big          =>           the biggest                         new       =>           the newest (NOT newwest)
                thin        =>           the  thinnest                      slow       =>           the slowest (NOT slowwest)
                slim        =>           the slimmest

The biggest cat in the world is the lion.

3)            If an adjective has two syllables and ends in y, change the y to i and add est. 
                funny    =>           the funniest                       silly         =>           the silliest
               
It’s the silliest film I’ve ever seen!

4)            For other adjectives with two or more syllables, DON’T add est. Write most before the adjective.
                interesting          =>           the most interesting      surprising            =>           the mostsurprising
                               
                It’s the most interesting book I’ve ever read.

5)            Some adjectives have irregular superlative forms. These are listed below.
                good      =>           the best
                bad        =>           the worst
                far          =>           the furthest

6)            a) In is often (but not always) used after a superlative adjective to describe where this statement is true.
                London is the biggest city in England.
                Everest is the highest mountain in the world.

                My brother is the tallest person in my family.