My backpack is (heavy) than your backpack.
heavier
My new car is (expensive) than my old one, but it's worth it.
more expensive
He is much (lazy) on weekends than during the week.
lazier
Mount Everest is the (high) mountain in the world.
highest
He is the (good) student in the entire class.
best
This is the (comfortable) chair in the entire house.
most comfortable
The blue whale is the (large) animal on Earth.
largest
Today's math homework was (easy) than yesterday's.
easier
He told a (funny) joke than the one I heard last night.
funnier
She thinks that sci-fi movies are (interesting) than comedies.
more interesting
My dog is much (happy) when he is playing in the park.
happier
The weather today is much (bad) than it was last week.
worse
The Great Wall of China is one of the (long) structures ever built.
longest
He is the (friendly) person in the neighborhood.
friendliest
My brother is much (tall) than me, so he can reach the top shelf.
taller
The test was (difficult) than we had expected.
more difficult