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The general rule is as follows: add -er and –est to one-syllable words and to two-syllable words ending in –y. The rest get more and most.
But I think "He is more clever than wise." is correct.
This sentence is not similar to "He is cleverer than Tom."
I learned we add "more" to clever in case we compare one personality to another of one person. Why do you add "more" though it violates a general rule?
I learned we add "more" to clever in case we compare one personality to another of one person. Why do you add "more" though it violates a general rule?
Best regards...
See FRC's post.
The Rule
Add -er to one-syllable words: One-syllable word: wise, wiser (OK)
Add more to two-syllable words: Two-syllable word: cle'ver, more clever (OK) *cleverer (Not OK)
Exception to the Rule Add -er to two-syllable words ending in -y: Two-syllable word ending in -y: happy, happier (OK)
comparative... 
Linear Mode
