1 clean- cleaner- the cleanest 2 easy- easier- the easiest 3 good-better- the best 4 dirty-dirtier - the dirtiest 5 fat-fatter- the fattest 6 beautiful- more beautiful - the most beautiful 7 sad-sadder - the saddest 8 flat - flatter - the flattest 9 active- more active - the most active 10 comfortable- more comfortable - the most comfortable