difficult (learining English / learning Japanese)
more difficult (Learning Japanese is more difficult than English.)
good for you (chips / yogurt)
better for you (Yogurt is better for you than chips.)
loud (an elephant / a lion)
louder (An elephant is louder than a lion.)
short (a lizard / a snake)
shorter (A lizard is shorter than a snake.)
dangerous (a snake / a giraffe)
more dangerous (A snake is more dangerous than a giraffe.)
hot (June / July)
hotter (July is usually hotter than June.)
heavy (a phone / a tissue)
heavier (A phone is heavier than a tissue. )
big (Canada / Ukraine)
bigger (Canada is bigger than Ukraine.)