Definition: If it snows, snow falls from the sky. Level: A2
正在下雪。
It's ___snowing.
开始下雪了。
It's starting to ___snow.
昨晚下了一夜雪，地面上覆盖了一层厚厚的白色雪层。
It had ___snowed overnight and a thick white layer covered the ground.
