what _weather and what_day

问题描述:

what _weather and what_day

what weather ; what a day
weather 不可数名词,前不能加不定冠词; day可数名词,可加a

what 引导的感叹句,单数形式为:what+a+adj.+noun.+he/she/it +is
what weather.weather 不可数 不加a what a day