• 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).
Her house is larger than mine.
• 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).
He is the kindest boy in class.