It's the words of two syllables where we get into trouble: more useful, more decent, more careful, more tender, more helpful. but. easier, happier, sillier, narrower, simpler. Generally, if a two-syllable word ends in /i/ or /o/ (e.g, easy, happy, silly, narrow), then it gets the morphological -er and -est. Otherwise it's more and most. Share. More @Wikipedia
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