big的最高级是biggest。比较级是bigger。big作“大”解时,形容物时指体积、面积、范围、容量和重量等“大”；形容人时侧重指身大体胖或辈分大，用于儿童则含“长大成熟”之义，有时也指大人物。
big用法例句
1、The wind was bouncing the branches of the big oak trees.
一棵棵高大橡树的枝条随风摇摆。
2、Big credits were given to East Germany by successive West German governments.
历届西德政府给予东德大量的贷款。
3、Bake some big red peppers and hollow them out.
将几个大红甜椒烤一烤，再把它们掏空。
4、New York is a big commercial city.
纽约是一座大的商业城市。
5、His business yields big profits.
他的生意带来巨大的利润。