There will be rain tomorrow 里的rain为什么不能改成rainy?

There will be rain tomorrow 里的rain为什么不能改成rainy? It will be rainy.There will be rain.为什么一个是rainy 一个是rain 1.①,There will be rain tomorrow.②.There will be rainy tomorr The TV says it will be ____(rain)tomorrow. 答案是rainy,可为什么不能为r will there be heavy rain tomorrow?的回答 There will be ( ) tomorrow.rain的适当形式. There will be rain 为什么将‘There ’改成‘It ’后‘rain ’就要加上‘ing’ 变成It 以下哪一句是正确的?为什么?1.There wil be rain tomorrow.2.There will be r there will be rain 一个 there be ：there will be ________(rain) tomorrow.这里填rain 还 There will be rainy tomorrow. there will be a rain能说是there will be rainy吗