Comparative adjectives compare differences between the two elements they modify (larger, smaller, faster, more difficult).
- Her flat is larger than ours
- This tablet is smaller than the one I lost
- You walk faster than me
Superlative adjectives indicate the greatest degree of a quality (the tallest, the smallest, the most vulnerable).
- Juan is the tallest student in our class
- He is the kindest cat I know
- Mount Everest is the highest mountain in the world
Forming comparatives and superlatives depends on the number of syllables of the adjective, that is, whether it is a short or a long word.
«ONE SYLLABLE» OR SHORT ADJECTIVES
Add -er for the comparative and -est for the superlative: ➯ NICE ➣ nicer ➣ the nicest . If the adjective has a consonant + single vowel + consonant, the final consonant doubles.
| Adjective | Comparative | Superlative | 
|---|---|---|
| fat | fatter | the fattest | 
| big | bigger | the biggest | 
| sad | sadder | the saddest | 
| hot | hotter | the hottest | 
| mad | madder | the maddest | 
| wet | wetter | the wettest | 
More than «one syllable» adjectives
They can form the comparative either by adding -er or by preceeding the adjective with more. They can form the superlative either by adding -est or by preceeding the adjective with most. In many cases, both forms are used, but more and most are more frequently used.
Adjectives ending in ➣y change to an ➣i , and must change ➯ ➣ er ➣ est , as in ➯ BUSY ➣ busier ➣ the busiest
| Adjective | Comparative | Superlative | 
|---|---|---|
| happy | happier | the happiest | 
| lazy | lazier | the laziest | 
| clever | cleverer | the cleverest | 
| white | whiter | the whitest | 
| strange | stranger | the strangest | 
Long adjectives
They always form the comparative with more and the superlative with most.
| Adjective | Comparative | Superlative | 
|---|---|---|
| important | more important | the most important | 
| expensive | more expensive | the most expensive | 
| dangerous | more dangerous | the most dangerous | 
Irregular comparatives and superlatives
| Adjective | Comparative | Superlative | 
|---|---|---|
| good | better | the best | 
| bad | worse | the worst | 
| little | less | the least | 
| much | more | the most | 
| far | further / farther | the furthest / farthest | 
Examples
- My bike is better than yours
- Your bike is less striking than mine
- This is the best large cylinder bike in the store
- That is the least spectacular bike in the store
- I am far from home, but you are even farther
- For further details, visit website
- The furthest corners of the human mind may be horrifying

reference: English for Life Pre-Intermediate Oxford
Make sentences comparing the two elements:
Examples
➣Dogs are friendlier than cats
➣The radio is sometimes more interesting than TV

MAKE SENTENCES in the superlative:
examples
➣Maths is the worst school subject
➣Prepositions are the most difficult thing in english

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reference: English for Life Beginner Oxford



