Rules:- If a word ends in a short vowel sound followed by a single consonant, double the consonant
before adding –er or –est.
1.
bigger
2.
biggest
3.
fatter
4.
fattest
5.
fitter
6.
fittest
7.
hotter
8.
hottest
9.
madder
10. maddest
11. sadder
12. saddest
13. wetter
14. wettest
15. slimmer
16. slimmest
17. gladder
18. gladdest
19. thinner
20. thinnest