1) Common - More common, most common 2) Powerful - More powerful, most powerful 3) Noisy - Noisier, noisiest 4) Safe - Safer, safest 5) Healthy - Healthier, healthiest 6) Dirty - Dirtier, dirtiest 7) Far - Farther/further, farthest/furthest 8) Difficult - More difficult, most difficult 9) Light - Lighter, lightest 10) Useful - More useful, most useful 11) Boring - More boring, most boring
1) Common - More common, most common
2) Powerful - More powerful, most powerful
3) Noisy - Noisier, noisiest
4) Safe - Safer, safest
5) Healthy - Healthier, healthiest
6) Dirty - Dirtier, dirtiest
7) Far - Farther/further, farthest/furthest
8) Difficult - More difficult, most difficult
9) Light - Lighter, lightest
10) Useful - More useful, most useful
11) Boring - More boring, most boring