it's raining or it's rainy or it's rain 哪个对?

it's raining or it's rainy or it's rain 哪个对?

都对.
it\'s raining 外面在下雨.
it\'s rainy这是很多雨的.
it\'s rain这是雨

it's raining
it's rainy
都可以

it's raining