Comparison (grammar) facts for kids
Adjectives and adverbs take three degrees, such as kind, kinder, kindest. The central degree is comparative, since for example Bill is kinder than Joe. whereas the first and third degrees make no comparison. Likewise the use of more as in more quickly is comparative, where quick and quickest are not.
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In Spanish: Grado (gramática) para niños
Comparison (grammar) Facts for Kids. Kiddle Encyclopedia.