Attractive - attractiver (+r)
bad - worse (irregular)
big - bigger (double consonants +er)
famous - more famous (more + adj)
far -не знаю...
fierce - more fierce (more+adj)
funny - funnier (y › ier)
good - better (irregular)
heavy - heavier (y › ier)
hot - hotter (double consonants + er)
large - larger (+r)
rich - richer (+er)
short - shorter (+er)
tall - taller (+er)
wide - wider (+r)