cleaner
older
busier
bigger
quieter
longer
more modern
more dangerous
younger
taller
newer
dirtier
more polluted
more beautiful
darker
smaller
uglier
mas contaminado
mas limpio
mas hermoso
mas grande
mas ruidoso
mas joven
mas alto
mas sucio
mas oscuro
mas peligroso
mas nuevo
mas pequeño
mas moderno
mas silencioso
mas feo
mas largo
mas viejo