The basic rules of forming comparatives:
One syllable words take -er:
clear -> clearer sweet -> sweeter
Multisyllable words take “more”:
incredible -> more incredible (not "incredibler") horrible -> more horrible (not "horribler")
Two-syllable words ending in consonant + y take “ier”:
happy -> happier pretty -> prettier
Both “more clear” and “clearer” are acceptable:
Your answer is more clear than mine.
Your answer is clearer than mine.
Frequency of use: clearer than is twice as common as more clear than, although both are common.
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