The comparative and the superlative Comparative adjectives

The comparative and the superlative
Comparative adjectives
Comparative adjectives are used to compare differences between the two objects they modify (larger, smaller, faster, higher). They are used in sentences where two nouns are compared, in this pattern:
Noun (subject) + verb + comparative adjective + than + noun (object).
Examples
My house is larger than hers.
This box is smaller than the one I lost.
Your dog runs faster than Jim's dog.
The rock flew higher than the roof.
Jim and Jack are both my friends, but I like Jack better. ("than Jim" is understood)
Superlative adjectives
Superlative adjectives are used to describe an object which is at the upper or lower limit of a quality (the tallest, the smallest, the fastest, the highest). They are used in sentences where a subject is compared to a group of objects.
Noun (subject) + verb + the + superlative adjective + noun (object).
The group that is being compared with can be omitted if it is clear from the context (final example below).
Examples
My house is the largest one in our neighborhood.
This is the smallest box I've ever seen.
Your dog ran the fastest of any dog in the race.
We all threw our rocks at the same time. My rock flew the highest. ("of all the rocks" is understood)
Forming regular comparatives and superlatives
Forming comparatives and superlatives is easy. The form depends on the number of syllables in the original adjective.
One syllable adjectives
Add -er for the comparative and -est for the superlative. If the adjective has a consonant + single vowel + consonant spelling, the final consonant must be doubled before adding the ending.

Adjective	Comparative	Superlative
tall	taller	tallest
fat	fatter	fattest
big	bigger	biggest
sad	sadder	saddest