ig bigger biggest
clean cleaner cleanest
short shorter shortest
long longer longest
wide wider widest
close closer closest
tidy tidier tidiest
pretty prettier prettiest
heavy heavier heaviest
hot hotter hottest
many more most
much more most
slim slimmer slimmest
bad worse worst
ill more ill most ill
fine finer finest
small smaller smallest
後补:
beautiful more beautiful most beautiful
old older oldest
early earier eariest
far farther farthest
good better best
well better best
little less least
sad sadder saddest
expemsive more expensive most expensive
important more important most import