What is the comparative sentence?

COMPARATIVE SENTENCE. A SENTENCE containing two clauses joined by a two-part comparative element: as … as (It's as big as a house); not so/as … as (It's not so/as good as it used to be); the same … as (It's just the same as it used to be); less/more … than (It's a lot less/more than I wanted to pay); (nicer/faster) … than (The car's faster than we expected).