Adjectives: Comparative / Superlative

Comparative

1 syllable
-er : older, cheaper, nicer, slower
CVC double de consonant : bigger, hotter

2,3,4 syllables
more / less : more expensive, less interesting

-y   (1,2,3,4 syllables)
-ier : easier, heavier, happier, scarier

irregular
good : better / bad : worse / far : further

Superlative

1 syllable
the -est : the oldest, the cheapest, the nicest, the biggest

2,3,4 syllables
the most / the least : the most expensive, the less interesting

-y   (1,2,3,4 syllables)
the -iest : the happiest, the easiest, the heaviest

irregular
the best / the worst / the farthest, the furthest

Comparison with adverbs

more / less : more slowly

Comparison with as..as

as big as
not as good as
the same .. as

Modifiers

a bit : un poco
a lot, much : mucho

Your T-shirt is expensive
Your T-shirt is more expensive
Your T-shirt is a bit more expensive
Your T-shirt is a lot more expensive
Your T-shirt is much more expensive