hard-working最高级是 the most harding working 比较级是 more hard working。在形容词词尾加上 “er” “est” 构成比较级、最高级的单词有：
bright(明亮的)—brighter—brightest
broad(广阔的)—broader—broadest
cheap(便宜的)—cheaper—cheapest
clean(干净的)—cleaner—cleanest
clever(聪明的)—cleverer—cleverest
cold(寒冷的)—colder—coldest
cool(凉的)—cooler—coolest
dark(黑暗的)—darker—darkest
dear(贵的)—dearer—dearest
deep(深的)—deeper—deepest
fast(迅速的)—faster—fastest
few(少的)—fewer—fewest
great(伟大的)—greater—greatest
hard(困难的,硬的)—harder—hardest
high(高的)—higher—highest
kind(善良的)—kinder—kindest
light(轻的)—lighter—lightest
long(长的)—longer—longest
loud(响亮的)—louder—loudest
low(低的)—lower—lowest
near(近的)—nearer—nearest
new(新的)—newer—newest
poor(穷的)—poorer—poorest
quick(快的)—quicker—quickest
quiet(安静的)—quieter—quietest
rich(富裕的)—richer—richest
short(短的)—shorter—shortest
slow(慢的)—slower—slowest
small(小的)—smaller—smallest
smart(聪明的)—smarter—smartest
soft(柔软的)—softer—softest
strong(强壮的)—stronger—strongest
sweet(甜的)—sweeter—sweetest
tall(高的)-taller-tallest
thick(厚的)—thicker—thickest
warm(温暖的)—warmer—warmest
weak(弱的)—weaker—weakest
young(年轻的)—younger—youngest
