Rule 1: When an adjective consists of one syllable add er to the end to make it a comparative adjective.
Examples:
Comparative
clean
cleaner
dark
darker
thick
thicker
soft
softer
warm
warmer
neat
neater
broad
broader
tall
taller
old
older
Exception to Rule 1: If the one syllable adjective ends with a consonant-vowel-consonant we need to double the last consonant before adding the er. However, if the last consonant is a w then we follow rule 1 instead.
Examples:
Comparative
big
bigger
dim
dimmer
fat
fatter
fit
fitter
flat
flatter
few
fewer
slow
slower
low
lower
Rule 2: When a two syllable adjective ends with y we need to replace the y with an i and then add the er.
Examples:
Comparative
busy
busier
dirty
dirtier
easy
easier
funny
funnier
noisy
noisier
happy
happier
heavy
heavier
lovely
lovelier
Rule 3: For an adjective with two or more syllabus (that does not end with y), we use add the word more or less in front of the adjective.
Examples:
Comparative
active
more active, less active
careless
more careless. less careless
famous
more famous. Less famous
cheerful
more cheerful, less cheerful
beautiful
more beautiful, less beautiful
generous
more generous, less generous
intelligent
more intelligent, less intelligent
valuable
more valuable, less valuable
Exceptions: There are some adjectives that have irregular comparative forms.
Examples:
Comparative
good
better
bad
worse
many
more
much
more
little
less
far
farther
The following video explains how to use comparative adjectives.
How to compare two things in English, using adjectives.
The following video cover the rules of comparative adjectives
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