Comparison in English
The English language compares adjectives by adding -errespectively -est to the end of the word.
big – bigger – biggest, tall – taller – tallest
If the adjective consists of more than one syllable
the comparison is formed by help of more and most .
interesting – more interesting – most interesting
two-syllable adjectives ending with -y compare by -ier:
easy – easier – easiest
Adjectives are compared by help of as and "than" .
I am as young as Joe, but I am older "than" Susan.