1) 1 syllable adjectives ending in ( ER, EST)

tall
cheap
small
green
high
big
poor
tough
wise

2) 2 syllable adjectives ending in "y, er, ow" (ER, EST)

angry
busy
easy
happy

pretty
clever
narrow
hollow

slender
yellow
shallow
tender

3) 2 syllable adjectives ending in "al, ant, ent, ish, ive, ic, ous, ful, less" (MORE, MOST)

active
careless
eager
famous
foolish
formal
modern
private
recent
secure
tragic
useful

4) Multisyllabic adjectives (MORE, THE MOST)

comfortable
curious
dangerous
intelligent
expensive
succcessful

.

Spelling rules:

1. Adjectives ending in: vowel + consonant + ER, EST > double consonant (big, bigger, the biggest)

fat
hot
red
sad
thin
wet

2. Adjectives ending in: "e" + ER, EST > "e" before the suffix is omitted (blue, bluer, the bluest)

brave
close
pale
rude
simple
wide

3. Adjectives ending in: consonant + "y" + ER, EST > "y" sifts for "i" (busy, busier, the busiest)

dry
happy___
shy
sleepy__ lucky
scary

* If before "y" there is a vowel, "y" doesn't change: gray, grayer, the grayest.

TEST Degrees of Comparison

sad
foolish
expensive
poor
simple
gray
shy
hollow

intelligent
careless
wet
lucky
cheap
tender
happy
dangerous