英语中人跟据乌云推断将要下雨用it's goingto rain为什么不用itwill be rain?

将要下雨用英语怎么说表示将要下雨一般用be going to rain ,很少用will rain，对不对 "将要下雨"用It will be rainy还是it will be rain [英语]It's going to rain还是It will rain? () the sky getsdark,it is goingto rain soon. does it often rain there in spring为什么用rain It's going to rain和 It'll be raining 用过去将来时说我认为将要下雨,I thought it was going to rain soon,但后面的不知道是加 It will be rainy.There will be rain.为什么一个是rainy 一个是rain There will be rain 为什么将‘There ’改成‘It ’后‘rain ’就要加上‘ing’ 变成It 英语翻译adele - right as rain who wants to be right as rain it's there is a possibility that it will rain.中为什么用that而不用which 和 be go rain it to