比较级和最高级互换(比较时要把自己排除在外.注意比较的范围)
eg.1.Shanghai is the largest city in China.
Shanghai is larger than any other city in China.
Shanghai is larger than any city in Africa
2.John is the thinnest student in the class.
John is thinner than any other student in the class.
John is thinner than anyone/anybodyelse in the class.