one year have four seasons的语法问题？？

应该说是 A year has 4 seasons.
或者There are 4 seasons in a year.

典型的中式英文。在英语中have一般用在人身上，如I have……；对于物来说，都是用there be的句型来表示“有”，所以这句话应该改成there are four seasons in a year。