he carries a big box than mary’s 这句话错了，应怎么该？

he carries a bigger box than mary's.

The box he carried is bigger than marry's

同意楼上若冰浅仓，不过还是觉着别扭。

he carries a box which is bigger than Mary's

he carries a box bigger than Mary's
不用用定语从句那么麻烦,用形容词做后置定语就可以了.