comparatives: comparing two things
adj. + er: bigger, faster, smaller, longer than
(3 or more syllables) more / less
Never add "er" + more
...more beautiful, more graceful, etc.
as + adjective + as...
Seoul is (not)as busy as Tokyo.
This car is (not) as fast as that one.
not as + adjective + as...


superlatives: comparing three or more things
big/bigger/biggest
tall/taller/tallest
short/shorter/ shortest
most
She is the most beautiful
He is the fastest
She is the most interesting