expensive的比较级和最高级是:

比较级:more expensive

意思是"更贵的"。

例句:This model is more expensive than the basic one.

这个型号比基本型号更贵。

最高级:most expensive

意思是"最贵的"。

例句:This luxury car is the most expensive model in the showroom.

这辆豪华轿车是展厅里最贵的型号。

所以,expensive的比较级是more expensive,添加more来构成;

最高级是most expensive,在expensive前加most构成。