大的：big

比较级：That uncertain thing was swelled bigger.

最高级：This is the biggest hospital in the locality.

小的：little

比较级：We have less to worry about now.

最高级：Who knows most says least.

聪明的：smart

比较级：He is smarter than me.

最高级：He is the smartest in our class.

高的：tall

比较级：I''m taller than her.

最高级：He is the tallest among them.

肥胖的：fat

比较级：I''m fatter than him.

最高级：Take the fattest marking pen you have.

短的：short

比较级：I''m shorter than her.

最高级：It is the shortest among them.

快的：fast

比较级：I run faster than him.

最高级：I run fastest among them.

努力的：hard

比较级：I work harder than him.

最高级：The hardest business decision I ever made was to build this building, says Packard.

多的：much

比较级：I eat more than him.

最高级：The administrators said they hope to sell most of the business as a going concern.

高兴：happy

比较级：I''m happier than her.

最高级：I think, with him, those were the happiest moments of my childhood.

参考资料

百度翻译： http://fanyi.baidu.com/