It often snows in winter (改为同义句)It —— often —— in winter.

问题描述:

It often snows in winter (改为同义句)It —— often —— in winter.

It —is— often —snowy— in winter。

snow的形容词是snowy
所以可以改为:it is snowy in winter.
构成主系表结构、再加上时间状语(in winter)则就ok咯~