Zhèɡe hézī zhēn dà!
这个盒子真大!
The box is absolutely huge!
Notes:
这个(Zhèɡe): this
盒子(hézī): box
真(zhēn): really
大(dà):big
Example:
A:这是谁的盒子?
Zhè shì shéide hézi?
Whose box is this?
B:这个盒子真大。
Zhèɡe hézī zhēn dà!
The box is absolutely huge!