Page 70 - Basic English Usage

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Some two-syllable adjectives have two comparatives and superlatives:
for example commoner/more common, politest/most polite. We usually
prefer the forms with more and most.
For information about how to use comparatives and superlatives, see 85.

How to make Comparative Adjectives

START Has the adjective Has the adjective = [No]
HERE got one syllable? got two syllables?

Yes

Does the adjective Does the adjective
Yes
end in-e? end in-y? [No]

[)
Change ytoi
\

Has the adjective
Yes
got two vowels?

Does the adjective
end in two Yes
consonants?

[io]

Y

Double the last
letter

YY
y
’
ADD -R PUT MORE
\ \
TO THE BEFORE THE
ADJECTIVE

ADD -ERTO THE ADJECTIVE |=
ADJECTIVE