1) EXPLANATION

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When comparing two things, use the following: 

With one-syllable adjectives, use -er.

• cold  colder
• small  smaller

With two syllable adjectives which end in -y,  use -ier

• easy  easier
• happy  happier

With multi-syllable adjectives use more or less

• difficult         more difficult / less difficult
• expensive     more expensive / less expensive
   

You can also use less with one-syllable adjectives.

• less rich
• less wide

Make comparisons with adjectives + than

France is bigger than Italy.  Chinese is more difficult than English. 

3 irregular adjectives: 

• bad - worse
• good - better 
• far - further  

2) TEST YOUR KNOWLEDGE