简单说来，比较级就是“更……”而最高级就是“最……”

例：old

older/elder

oldest/eldest

young_younge_youngest

tall__taller_tallest

long-longer-longest

short-shoter-shortest

strong-stronger-strongest

small-smaller-smallest

tall-taller-tallest

strong-stronger-strongest

fat-fatter-fattest

big-bigger-biggest

thin-thinner-thinnest